VT3 - Simply Scuba

VT3 - Simply Scuba
VT 3
Dive Computer
Operating Manual
CONTENTS
WARRANTY, NOTICES, DECOMPRESSION MODEL .................................................................................................... 7
FCC ID ............................................................................................................................................................................... 8
INTRODUCTION AND GENERAL FEATURES AND DISPLAYS .................................................................................... 9
INTERACTIVE CONTROL CONSOLE ..................................................................................................................... 10
OPERATING MODE STRUCTURE ........................................................................................................................... 11
AUDIBLE ALARM ...................................................................................................................................................... 12
SMARTGLO BACKLIGHT ........................................................................................................................................ 14
POWER SUPPLY ...................................................................................................................................................... 15
BAR GRAPHS ........................................................................................................................................................... 17
PC INTERFACE ......................................................................................................................................................... 19
SYMBOLS AND ALPHA NUMERIC GRAPHICS ...................................................................................................... 19
ALPHA / NUMERIC DISPLAYS ................................................................................................................................ 20
Tank Pressure Display .......................................................................................................................................... 20
Depth Displays ...................................................................................................................................................... 20
Air Time Remaining Display ................................................................................................................................. 20
Date. Time, and Temperature Displays ................................................................................................................ 21
FREE Dive Mode Displays ................................................................................................................................... 21
SURFACE SEQUENCE AND OPERATING MODES ..................................................................................................... 23
OPERATING MODES ................................................................................................................................................ 24
SURFACE MODE ...................................................................................................................................................... 24
NORM (Normal) Surface Main Display ................................................................................................................ 25
NORM Surface Main Button Operations .............................................................................................................. 26
VT3 Battery Status .............................................................................................................................................. 27
Transmitter Status .............................................................................................................................................. 27
SET MODES .............................................................................................................................................................. 28
SET F GROUP (FO2) ................................................................................................................................................ 28
Set FO2 for NORM Nitrox Dives .......................................................................................................................... 29
3
CONTENTS (continued)
4
Set FO2 GAS 1 ..................................................................................................................................................... 31
Set FO2 GAS 2 ..................................................................................................................................................... 32
Set FO2 GAS 3 ..................................................................................................................................................... 33
Set FO2 50% Default ........................................................................................................................................... 34
SET A GROUP (NORM/GAUG ALARMS) ................................................................................................................ 34
Set Audible Alarm ................................................................................................................................................. 35
Set Depth Alarm ................................................................................................................................................... 36
Set EDT (Elapsed Dive Time) Alarm ................................................................................................................... 37
Set TLBG (Tissue Loading Bar Graph) Alarm ...................................................................................................... 38
Set DTR (Dive Time Remaining) Alarm ................................................................................................................ 39
Set Turn Pressure Alarm (TMT1) ......................................................................................................................... 40
Set End Pressure Alarm ....................................................................................................................................... 41
Set PO2 Alarm ...................................................................................................................................................... 42
SET U GROUP (UTILITIES) ...................................................................................................................................... 43
Set Wet Activation ................................................................................................................................................ 44
Set Units of Measure ............................................................................................................................................ 45
Set NORM Safety Stop ......................................................................................................................................... 46
Set Conservative Factor ....................................................................................................................................... 47
Set Backlight Duration .......................................................................................................................................... 48
Set Sampling Rate ................................................................................................................................................ 49
Set TMT1 (Transmitter 1 Link Code) .................................................................................................................... 50
Set TMT (Transmitter) 2-3 Use ............................................................................................................................ 52
Set TMT2 (Transmitter 2 Link Code) ................................................................................................................... 53
Set TMT3 (Transmitter 3 Link Code) ................................................................................................................... 55
SET T GROUP (TIME/DATE) .................................................................................................................................... 57
Set Hour Format ................................................................................................................................................... 58
Set Time ................................................................................................................................................................ 58
Set Date ................................................................................................................................................................ 59
SERIAL NUMBER (VT3) ........................................................................................................................................... 60
NORM SURF ALT DISPLAY (SURFACE ALTERNATE) ........................................................................................... 61
NORM PLAN MODE .................................................................................................................................................. 61
FLY MODE ................................................................................................................................................................. 64
SAT MODE (DESATURATE) ..................................................................................................................................... 66
CONTENTS (continued)
NORM/GAUG LOG MODE ........................................................................................................................................ 67
NORM/GAUG HISTORY MODE ................................................................................................................................ 72
OVERVIEW OF DISPLAYED SYMBOLS AND ICONS ............................................................................................ 74
OVERVIEW OF DIVE MODE OPERATION ................................................................................................................... 75
POSITIONING OF THE VT3 ..................................................................................................................................... 77
Link Interruption Underwater ................................................................................................................................ 77
DIVE TIME REMAINING (DTR) ................................................................................................................................. 78
No Decompression Dive Time Remaining (NDC) ................................................................................................ 79
Oxygen Accumulation Time Remaining (OTR) .................................................................................................... 80
Air Time Remaining (ATR) .................................................................................................................................... 80
Air Time Remaining Alarm .................................................................................................................................... 81
ASCENT RATE ALARM ............................................................................................................................................ 82
CONTROL OF DISPLAYS ......................................................................................................................................... 83
WET CONTACTS ....................................................................................................................................................... 84
NORM TYPE DIVE MODES ........................................................................................................................................... 85
NORM NO DECOMPRESSION DIVE MODE ........................................................................................................... 86
NORM Dive No Deco Safety Stop ....................................................................................................................... 89
DECOMPRESSION DIVE MODE ........................................................................................................................ 91
VIOLATION MODES .................................................................................................................................................. 95
NORM HIGH PO2 .................................................................................................................................................... 100
HIGH OXYGEN ACCUMULATION .......................................................................................................................... 101
SUMMARY OF NORM/GAUG WARNING AND ALARM MESSAGES .................................................................. 102
SWITCHING GAS MIXES AND BUDDY PRESSURE CHECK .................................................................................... 103
SWITCHING GAS MIXES (NORM ONLY) .............................................................................................................. 104
BUDDY PRESSURE CHECK (NORM ONLY) ......................................................................................................... 109
NORM POST DIVE MODES ......................................................................................................................................... 113
TRANSITION PERIOD ............................................................................................................................................ 114
AFTER THE TRANSITION PERIOD ....................................................................................................................... 116
5
CONTENTS (continued)
GAUGE OPERATING MODE ....................................................................................................................................... 117
GAUG SURFACE DISPLAYS .................................................................................................................................. 118
GAUG DIVE DISPLAYS .......................................................................................................................................... 119
FREE DIVE OPERATING MODE ................................................................................................................................. 121
FREE SURFACE DISPLAYS ................................................................................................................................... 122
FREE COUNTDOWN TIMER (CDT) ....................................................................................................................... 124
SET FREE CDT ....................................................................................................................................................... 126
SET FREE EDT (ELAPSED DIVE TIME) ALARM .................................................................................................. 127
SET FREE DEPTH ALARMS .................................................................................................................................. 128
FREE DIVE DISPLAYS ............................................................................................................................................ 132
FREE DIVE ALARMS .............................................................................................................................................. 133
ENTRY INTO DECO DURING A FREE DIVE ......................................................................................................... 136
REFERENCE ................................................................................................................................................................. 137
UPLOADING SETTINGS AND DOWNLOADING DATA ........................................................................................ 138
PC Compatibility Requirements .......................................................................................................................... 139
CARE AND CLEANING ........................................................................................................................................... 140
INSPECTIONS AND SERVICE ............................................................................................................................... 140
BATTERY REPLACEMENT .................................................................................................................................... 142
INSTALLING A TRANSMITTER ON A REGULATOR ............................................................................................ 148
TRANSMITTER COMPATIBILITY WITH NITROX .................................................................................................. 148
ALTITUDE SENSING AND ADJUSTMENT ............................................................................................................ 149
CHARTS OF NO DECOMPRESSION LIMITS AT ALTITUDE ................................................................................ 150
CHART OF OXYGEN EXPOSURE LIMITS ............................................................................................................ 151
SPECIFICATIONS ................................................................................................................................................... 152
ADDITIONAL INFORMATION PERTAINING TO FREE DIVE MODE .................................................................... 159
INSPECTION/ SERVICE RECORD ......................................................................................................................... 160
FULL DISPLAY ........................................................................................................................................................ 161
OCEANIC WORLD WIDE ....................................................................................................................................... 162
6
Pay special attention to items marked
with this Warning symbol.
LIMITED TWO-YEAR WARRANTY
For details, refer to the Product Warranty Registration Card provided. Register on-line at www.OceanicWorldwide.com
COPYRIGHT NOTICE
This operating manual is copyrighted, all rights are reserved. It may not, in whole or in part, be copied, photocopied,
reproduced, translated, or reduced to any electronic medium or machine readable form without prior consent in writing
from Oceanic / 2002 Design.
VT3 Operating Manual, Doc. No. 12-2705
© 2002 Design, 2006
San Leandro, CA USA 94577
TRADEMARK, TRADE NAME, AND SERVICE MARK NOTICE
Oceanic, the Oceanic logotype, the Oceanic 'O' symbol, VT3, the VT3 logo, Air Time Remaining (ATR), Diver Replaceable Batteries, Graphic Diver Interface, Tissue Loading Bar Graph (TLBG), Pre Dive Planning Sequence (PDPS),
SmartGlo, Set Point, Control Console, Turn Gas Alarm, and OceanLog are all registered and unregistered trademarks ,
trade names, and service marks of Oceanic. All rights are reserved.
PATENT NOTICE
U.S. Patents have been issued, or applied for, to protect the following design features:
Air Time Remaining (U.S. Patent no. 4,586,136 and 6,543,444) and Data Sensing and Processing Device (U.S. Patent
no. 4,882,678). Set TLBG Alarm and other patents pending. User Setable Display (U.S. Patent no. 5,845,235) is
owned by Suunto Oy (Finland).
DECOMPRESSION MODEL
The programs within the VT3 simulate the absorption of nitrogen into the body by using a mathematical model. This
model is merely a way to apply a limited set of data to a large range of experiences. The VT3 dive computer model is
based upon the latest research and experiments in decompression theory. Still, using the VT3, just as using the
U.S. Navy (or other) No Decompression Tables, is no guarantee of avoiding decompression sickness, i.e. “the bends.” Every diver’s physiology is different, and can even vary from day to day. No machine can
predict how your body will react to a particular dive profile.
7
WARNING: If your VT3 stops working for any reason while operating as a Dive Computer, it is important that you have anticipated
this possibility and are prepared for it. This is an important reason for not pushing the no decompression and oxygen exposure
limits, and a critical reason to avoid entering decompression. If
you dive in situations where your trip would be ruined or your
safety would be jeopardized by losing the use of your VT3, a
backup instrument system is highly recommended.
FCC ID: MH8A
FCC COMPLIANCE:
This equipment complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1.) this equipment may not
cause harmful interference, and 2.) this equipment must accept any interference received, including interference that may cause undesired
operation.
FCC INTERFERENCE STATEMENT:
This equipment has been tested and found to comply with the limits for an Intentional Radiator, a Class B Digital Device, pursuant to Part
15 of FCC Rules, Title 47 of the Code of Federal Regulations. These rules are designed to provide reasonable protection against harmful
interference in a commercial or residential installation. This equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
There is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
 Reorient or relocate the receiving antenna.
 Increase the separation between the equipment and receiver.
 Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
 Consult the dealer or an experienced radio/TV technician.
Warning: Changes or modifications to this unit not expressly approved by Oceanic/2002 Design could
void the user's authority to operate the equipment.
8
WARNING: Prior to diving with the VT3, you
must also read and understand the Oceanic
Dive Computer Safety and Reference Manual,
Doc. No. 12-2262, which provides Important
Warnings and Safety Recommendations as
well as general product information.
INTRODUCTION
AND
GENERAL FEATURES AND DISPLAYS
9
INTRODUCTION
Welcome to OCEANIC and thank you for choosing the VT3 !
It is extremely important that you read this Operating Manual in sequence and understand
it completely before attempting to use the VT3 as a dive computer.
It is equally important that you read the Oceanic Dive Computer Safety and Reference
Manual (Doc. No. 12-2262) provided with your VT3. It contains information that you must
become familiar with prior to diving with your VT3.
Remember that technology is no substitute for common sense, and a dive computer only
provides the person using it with data, not the knowledge to use it.
INTERACTIVE CONTROL CONSOLE
The Interactive Control Console consists of 3 Control Buttons that allow you to select mode
options and access specific information. They are also used to link the Transmitter(s), enter
Settings, activate the Backlight, and acknowledge the Audible Alarm.
Throughout this manual they will be referred to as the M, S, and A buttons.
 Left/Front - Mode (M) button
 Right/Front - Advance (A) button
S
 Right/Side - Select (S) button
M
10
A
OPERATING MODE STRUCTURE
The M button is used to access 3 operating Modes (Fig. 1) that
include NORM (Normal Air/Nitrox Dive Computer), GAUG
(Digital Gauge Mode), and FREE (Free Dive Mode).
The screens of the Main Modes and Sub Modes will remain on
display until a button is pressed to access another screen or
Mode, activate a sequence, or for 2 minutes if no button is
pressed.
When Wet Activation is set On, the VT3 will enter the selected
Dive Mode upon descent to 5 FT (feet) /1.5 M (meters), regardless of what surface screen is displayed at the time.
WARNING: When Wet Activation is set OFF, the
VT3 must be activated by push button prior to
the first dive of a new series. Commencing a
dive will not activate Dive Mode unless Wet
Activation is set ON or the unit is activated.
Entering Settings and Plan Mode are available in NORM SURF
Mode which also allows access to Battery/Transmitter Status,
Fly, Desat, Log, and History Modes. Tank Pressure is displayed
if a Transmitter is active and Linked with the VT3.
NORM (Normal Air/Nitrox)
GAUG (Digital Gauge Mode)
FREE (Mode)
Fig. 1 - Operating Modes
11
GAUG Surface Mode allows access to Battery/Transmitter Status, Fly, Log, and History
Modes. It also displays Tank Pressure.
FREE Mode allows access to sub modes by first accessing NORM Surface Mode. It does
not display Tank Pressure.
Once a dive is made in GAUG Operating Mode, the VT3 is locked into that Mode for 24
hours after the dive.
The VT3 also features 2 modes for use of Transmitter Pressure. A setting allows you to
choose whether Transmitters 2 and 3 are for your use (SELF) or for checking 1 or 2 Buddies' Tank Pressure(s). The setting remains fixed until changed in the NORM/GAUG SET
U menu.
AUDIBLE ALARM
Most warning situations that activate the Audible Alarm while operating in NORM or
GAUG Mode cause the VT3 to emit 1 beep per second for 10 seconds, or until the situation is corrected, or it is acknowledged by momentarily pressing and releasing the S button
(less than 2 seconds). After being acknowledged and the situation corrected, the Alarm
will sound again upon reentry into the warning situation, or entry into another type of
warning situation.
FREE Dive Mode has its own set of Alarms which emit 3 short beeps either 1 or 3 times
which cannot be acknowledged or set Off.
12
A red LED Warning Light, located on the left side of the housing, is synchronized with the
Audible Alarm. It will flash as the Audible Alarm sounds. It will turn Off when the Alarm is
acknowledged or the situation is corrected. The Audible and LED will not be active if the
Alarm is Set OFF (a group A setting).
Situations that will activate the NORM/GAUG 10 second Alarm include  Air Time Remaining (ATR) at 5 minutes, then again at 0 minutes.
 ATR becomes less than No Deco and O2 Time Remaining for 1 minute.
 Turn Pressure at the Set Point selected (Transmitter 1).
 End Pressure at the Set Point selected (active Transmitter).
 Descent deeper than the Max Depth Set Point selected.
 Dive Time Remaining at the Set Point selected.
 Elapsed Dive Time at the Set Point selected.
 High PO2 of 1.60 ATA or the Set Point selected.
 High O2 of 300 OTU (single or daily exposure).
 Tissue Loading Bar Graph at the segment Set Point selected.
 NORM/GAUG Ascent Rate exceeds 60 FPM (18 MPM) when deeper than 60 FT (18
M), or 30 FPM (9 MPM) at 60 FT (18 M) and shallower.
 Loss of the active Transmitter Link signal for more than 15 seconds during a dive.
 Entry into Decompression Mode (Deco).
 Conditional Violation (above a required Deco Stop Depth for less than 5 minutes).
 Delayed Violation (above a required Deco Stop Depth for more than 5 minutes).
 Delayed Violation (a Deco Stop Depth greater than 60 FT/18 M is required).
 Delayed Violation (Maximum Operating Depth of 330 FT/100 M is exceeded).
 A Gas Switch to another tank would expose the diver to PO2 greater than 1.60 ATA.
13
A single short beep (which cannot be disabled) is emitted for the following  Upon completion of a Hot Swap battery change.
 Change from Delayed to Full Violation 5 minutes after the dive.
3 short beeps (which cannot be disabled) are emitted for the following  FREE Dive Elapsed Dive Time Alarm (3 beeps every 30 seconds if set On).
 FREE Dive Depth Alarms 1/2/3 (set sequentially deeper) - each 3 beeps 3 times.
 FREE Dive TLBG Alarm (Caution zone, 7 segments) - 3 beeps 3 times.
 Entry into Deco during a FREE Dive (Permanent Violation) - 3 beeps 3 times.
 Free Dive Mode Countdown Timer reaches 0:00 - 3 beeps 3 times.
During the following NORM Dive situations, the 10 second Audible Alarm will not turn off
when acknowledged  Ascending above a required Decompression Ceiling Stop Depth for more than 5
minutes (referred to as a Delayed Violation).
 Decompression requires a Ceiling Stop Depth of 70 FT/21 M or deeper.
 Being on the Surface for 5 minutes after a Conditional Violation.
SMARTGLO® BACKLIGHT
To activate the SmartGlo Backlight - press the S button.
 If ambient light level is low, the Backlight will activate and illuminate the display for
button depression time* plus the user set Duration time of 0, 5, or 10 seconds, for a
maximum of 20 seconds.
(*The Backlight will turn Off if the button is depressed for more than 10 seconds.)
 Press the button again to activate as desired.
14
NOTE: Extensive use of the Backlight reduces
estimated Battery life. Also, the Backlight does
not operate during a Low VT3 Battery Condition
or when the VT3 is connected to a PC.
a
POWER SUPPLY
The VT3 utilizes one 3 volt CR2450 Lithium Battery. The Battery
should operate normally for 1 year or 300 dive hours if 2 dives
are conducted during each dive period. The VT3 checks its
battery voltage every 2 minutes during surface operation.
 If voltage of the VT3 decreases to the Warning level (2.75
volts), the Battery icon will appear on Surface display
screens (Fig. 2a) as an indication that the Battery should be
changed prior to commencing a series of dives.
 If the VT3's voltage decreases to the Alarm level (2.50
volts), the Battery icon will flash and the VT3 will shut Off.
 Low Battery Warning/Alarm conditions are not displayed
during Dive Modes.
 If a Low Battery Condition was not displayed prior to
starting a Dive, and a Low Battery Condition occurs during
the dive, there will be sufficient Battery power remaining to
maintain operation for the remainder of that dive.
Fig. 2 - Low Battery Warning
Fig. 3 - Low Battery Alarm
15
Fig. 4 - Battery Status (Good)
Fig. 5 - Transmitter 1 Battery
Status (Good)
Fig. 6 - Transmitter 3 Status
(Not Available)
16
Transmitters use one 3 volt, CR2 Lithium Battery. A Transmitter's
battery should provide normal operation for 1 year or 300 dive
hours. Transmitters check battery voltage when they are pressurized and will send a Low Battery signal to the Receiver in the
VT3 when the voltage drops below the Warning level.
 Transmitter Low Battery Warning/Alarm conditions are only
displayed on Status screens that can be accessed while
viewing the NORM Surface Display.
To check the condition of the VT3 or a Transmitter's Battery if
NORM or GAUG Mode is selected, depress the S button for 2
seconds while viewing the NORM or GAUG Surface Main
Display, then release it.
 As the button is depressed, the VT3's Receiver will activate.
 2 seconds later, the VT3's Battery status will be displayed
for 3 seconds (Fig. 4), then  if active and linked, Transmitter 1's Battery status will be
displayed for 3 seconds (Fig. 5), then  if active and linked, Transmitter 2's Battery status will be
displayed for 3 seconds, then  if active and linked, Transmitter 3's Battery status will be
displayed for 3 seconds, then  the display will then revert to Surface Mode.
 If a Transmitter is not active and linked, the message
NotAvAil (not available) will be displayed (Fig. 6).
BAR GRAPHS
The VT3 features a Tissue Loading Bar Graph (TLBG) (Fig. 7a) that represents your relative
no decompression or decompression status.
As your Depth and Elapsed Dive Time increase, segments will add to the TLBG, and as you
ascend to shallower depths, the segments of the TLBG will begin to recede, indicating that
additional no decompression time is allowed.
The TLBG monitors 12 different nitrogen compartments simultaneously and displays the one
that is in control of your dive. It consists of 8 segments, the lower 7 represent No Decompression status and the 8th at the top indicates a Decompression condition.
When the VT3 is set to operate in NORM Nitrox mode, the 5 segment O2 Bar Graph
(O2BG) (Fig. 7b) will represent oxygen accumulation.
Displays associated with oxygen and the O2 Bar Graph will be
displayed if FO2 for any Gas (1, 2, or 3) has been set at a
b
value other than 'Air' (e.g., a numerical value).
a
The O2BG will show the maximum of either per dive accumulated oxygen or 24 hour period accumulated oxygen. As your
oxygen exposure (accumulation) increases during a NORM
dive, segments will add to the O2BG, and as saturation decreases, it will begin to recede, indicating that additional exposure is allowed for that dive and 24 hour period.
Fig. 7 - TLBG and O2BG
17
VARI
Deeper than 60 FT (18 M)
Segments
Ascent Rate =
Displayed
FPM
MPM
0
0-20
0-6
1
21-30 6.1-9
2
31-40 9.1-12
3
41-50 12.1-15
4
51-60 15.1-18
5
60 +
18 +
60 FT (18 M) & Shallower
Segments
Ascent Rate =
Displayed
FPM
MPM
0
0-10
0-3
1
11-15 3.1-4.5
2
16-20 4.6-6
3
21-25 6.1-7.5
4
26-30 7.6-9
5
30 +
9+
a
18
Fig. 8 - VARI
The VT3 will store oxygen accumulation calculations for up to 10
dives conducted during a 24 hour period. If the maximum limit
for NORM dive oxygen loading has been exceeded for that day
(24 hour period), all of the segments of the O2BG will be
displayed flashing.
Depth/Time values will not appear in Plan Mode until the O2BG
recedes into the normal zone (lower 4 segments) indicating that
your daily oxygen dosage has decreased an amount equivalent
to the amount accumulated during the latest dive completed.
The VT3 also features a 5 segment NORM/GAUG Mode
Variable Ascent Rate Indicator (VARI) (Fig. 8a) that provides a
visual representation of ascent speed (i.e., an ascent speedometer). The segments of the VARI represent two sets of speeds
which change at a reference depth of 60 feet (18 meters). Refer
to the chart for segment values.
WARNING: At depths greater than 60 feet (18
meters), ascent rates should not exceed 60 feet
per minute (18 meters per minute). At depths of
60 feet (18 meters) and shallower, ascent rates
should not exceed 30 feet per minute (9 meters
per minute).
PC INTERFACE
Interface with a PC is accomplished by connecting the VT3 to a PC USB Port using the USB
Interface Cable provided. The same Cable is used for Upload and Download.
The software program is on the OceanLog CD provided, together with a USB Driver. The
program's Help section serves as the User Manual and can be printed for personal use.
The Settings Upload program is used to check the VT3's existing Settings and for entering
settings into the VT3. The Data Download program is used to retrieve Data that was
sampled during dives and stored in the VT3's memory.
The VT3 checks for an External Access request once every second while in Surface Mode.
Checks are not made if the unit is WET. For a connection to be made, the Interface Cable
is plugged into the VT3's Data Port and plugged into a PC USB Port. To establish the
connection, the PC program must be running asking 'RUTHERE'. When the connection is
made, all segments of the VT3 appear on the display until completion of the Upload or
Download operation.
 The VT3 reverts to the Surface Mode Main screen after completion of the Upload or
Download operation, or after 2 minutes if no PC action was taken.
SYMBOLS AND ALPHA NUMERIC GRAPHICS
The upper line of digits on the LCD screen is used to convey alpha Messages such as Day
of the Week, Operating Modes, items being Set, Gas and Transmitter identification,
Altitude level, and Alarm identification. At times, the second line is also used to display
alpha numeric graphics such as PO2 and On/Off. The FO2 setting of a selected Gas will
appear in the lower line.
19
a
b
ALPHA / NUMERIC DISPLAYS
Tank Pressure Display (NORM/GAUG only)
When the VT3's Receiver is set ON and active, Tank Pressure
from an active Transmitter that is properly linked will be displayed on the NORM or GAUG MAIN screens (Fig. 9a).
Values of Pressure are displayed numerically from 000 PSI (00
BAR) up to 5,000 PSI (345 BAR) in increments of 5 PSI (1 BAR).
Fig. 9 - Main Dive Display
a
Fig. 10 - ALT Dive Display
b
a
Depth Displays (all Modes)
During dives, the Current Depth display (Fig. 9b) and Maximum Depth which is accessed as an Alternate Display (Fig.
10a) indicate Depths from 0 to 399 FT (120 M) in increments of
1 FT (.1 M).
During a No Decompression Safety Stop, the set Stop Depth
(Fig. 11a) is displayed and during a Decompression condition,
the required Ceiling Stop Depth is displayed. These Depths
are graphically on the top row of the screen with the letters F
indicating Feet and M indicating Meters. (ex: 10F = 10 FT Stop)
Air Time Remaining (ATR) Display
Fig. 11 - Safety Stop Display
20
If the VT3's Receiver and a Transmitter are active and properly
linked, ATR is displayed digitally in decrements of 10 minutes
when it is 60 minutes or less (Fig. 11b).
Time, Date, Temperature Displays
Time of Day and NORM/GAUG Mode displays are
shown in hour:minute format (i.e., 1:16 represents 1 hour and
16 minutes, not 116 minutes).
FREE Dive Mode displays are shown in minute:second
format. The colon that separates hours and minutes (minutes and
seconds) blinks once per second when the display is indicating
real time (e.g., Surface Interval, Elapsed Dive Time), and is solid
(non-blinking) when times are calculated projections (e.g., Time
to Fly, Plan).
The Primary Time display, at the bottom of the screen, has the
largest digits of the display (Fig. 12a). Another time display
(Fig. 12b) is located in the middle row. Both displays are
identified by the symbol TIME.
There is an Alternate Display providing Day of Week, Temperature, and Time of Day. This common display (Fig. 13)
can be accessed while operating in NORM, GAUG, or FREE
Modes while on the Surface and during Dives.
Date is displayed only to identify dives when they are accessed
in the LOG Mode. When set for Imperial Units, Month is to the
left of Day (Fig. 14a) separated by a decimal point (month.day).
When set for Metric, Month is to the right of Day (day.month).
b
a
Fig. 12 - Time Displays
Fig. 13 - Time of Day
a
Fig. 14 - Date (Log Mode)
21
NOTE: Each display represents unique pieces of information. It is imperative that you understand the formats,
ranges, and values of the information represented to
avoid any possible misunderstanding that could result in
error.
You must also understand the icons, symbols, and alpha/
numeric messages presented.
The Informational Displays are described in detail as the
various operating modes they appear in are presented
throughout this manual.
22
WARNING: Prior to diving with the VT3, you
must also read and understand the Oceanic
Dive Computer Safety and Reference Manual,
Doc. No. 12-2262, which provides Important
Warnings and Safety Recommendations as
well as general product information.
SURFACE SEQUENCE
AND
OPERATING MODES
23
OPERATING MODES
As described previously, the VT3 features 3 Operating Modes  NORM - for Normal Air or Nitrox dives
 GAUG - for dives with no Nitrogen/Oxygen calculations
 FREE - for dives with no SCUBA
Fig. 15A - NORM SURF MAIN
REMINDER: Once a dive is made in GAUG Mode,
the VT3 is locked into that Mode for 24 hours
after the dive.
SURFACE MODE
Fig. 15B - GAUG SURF MAIN
Fig. 15C - FREE SURF MAIN
24
After activation and while the default Surface Main screen is
displayed, pressing and holding the M button for 2 seconds
steps through the operating mode Surface Main screens.
Fig. 15 - NORM MAIN >> GAUG MAIN >> FREE MAIN
 The Operating Mode selected (NORM, GAUG, or FREE)
will remain on display for 2 hours until a dive is made or
another Operating Mode is selected.
If a dive has been conducted within the past 24 hours, the SURF
MAIN screen for that mode will be displayed until changed.
At any time while operating in Surface Modes, the VT3 will enter
Dive Mode upon descent to 5 FT (1.5 M).
The VT3 will enter POST DIVE SURFACE MODE following a dive
upon ascent to 4 FT (1.2 M). The Surface Interval Time colon
will flash during the first 10 minutes after a NORM/GAUG dive
(Fig. 16), or first 1 minute after a FREE dive.
During the first 2 hours after a dive, the SURF MAIN screen for
the Operating Mode selected prior to the dive (NORM, GAUG,
or FREE) remains on display as the Default SURF MAIN screen.
NORM SURF MAIN, information provided includes (Fig. 17):
> Graphic NORM alternating with the Altitude Level graphic
SEA (or EL2 through EL7) and WET (if the unit is wet), each
On 3 seconds then 1/4 second blank.
> Battery icon if an VT3 Low Battery Warning Condition
exists, flashing if Too Low
> Tank Pressure and symbol PSI (or BAR), if the Receiver is
successfully Linked with an active Transmitter.
> Symbol DIVE and Number of that dive (0 if no dive has
been made yet).
> Symbols TIME and SURF, and Surface Interval (hr:min).
> NITROX symbol, if any GAS is set for a Nitrox dive.
> Tank 1 icon representing GAS 1, which is the default start
Gas and default Gas 10 minutes after a dive.
> TLBG if any after a NORM or FREE dive.
> O2BG if any after a NORM Nitrox dive.
Fig. 16 - NORM SURF MAIN
(post dive, unit wet)
Fig. 17 - NORM SURF MAIN
(no dive made yet, dry)
25
NORM SURF MAIN - Button Operations:
 Pressing the S button will activate the Smartglo Backlight.
 Pressing and releasing the A button repeatedly (< 2 seconds each time) will step
through the NORM Surface Sequence >> NORM SURF MAIN > NORM SURF ALT > PLAN > FLY > SAT > LOG > HISTORY.
 Depressing both the A and S buttons simultaneously for 2 seconds will access the SET
Menu (F > A > U > T) and a VT3 Serial Number display.
>> SURF MAIN > SET FO2 > SET Alarms > SET Utilities > SET TIME > SN
 Pressing and holding the M button for 2 seconds will access the GAUG SURF MAIN
screen with the graphic GAUG flashing, then another 2 second press will access the
FREE SURF MAIN screen with the graphic FREE flashing.
>> NORM SURF >> GAUG SURF >> FREE SURF
 Pressing and releasing the M button momentarily (< 2 seconds) while GAUG or FREE
is displayed flashing will select that as the Operating Mode as indicated by the
graphic becoming solid.
 When one Mode graphic in the series is solid, it is the 'selected Operating Mode'.
Ensure it is that Mode that you want and will be diving in.
 Depressing the S button for 2 seconds while viewing the NORM SURF screen will
activate the VT3's Receiver and access a series of screens that will indicate the Status
of the Batteries and Pressures of the Tanks in use.
26
 Each screen will be displayed for 3 seconds. VT3 Battery
Status, then TMT 1 Battery Status and Tank Pressure, then
TMT 2 Battery Status and Tank Pressure, then TMT 3 Battery
Status and Tank Pressure, then revert to SURF MAIN.
 Transmitter Battery Status is not displayed for TMT 2 and 3 if
TMT 2 - 3 USE is set for Buddy Pressure Check.
VT3 BATTERY STATUS, information includes (Fig. 18):
> Graphics VT3 and bAt
> Graphic Good (or Lo)
> Battery icon, if a Low Battery Warning Condition exists.
Flashing if an Alarm Condition exists.
TMTs that are active and Linked will transmit signals conveying
Tank Pressure and Battery Status for display on the Status screens.
If a TMT is not active or active but not Linked, the Status screen(s)
will display NotAvAil (Not Available).
TRANSMITTER STATUS, information includes (Fig. 19 A/B):
> Graphics TMT1 (then TMT2 and TMT3), identifying the
reporting Transmitter, and bAt.
> Graphic Good (or Lo), or NotAvAil (if not active/linked)
> Battery icon, if a Low Battery Warning Condition exists.
Flashing if an Alarm Condition exists.
> Tank Pressure for the TMT reporting and symbol PSI (or BAR).
Fig. 18 - VT3 Battery Good
Fig. 19A - TMT1 Battery Low
Fig. 19B - TMT3 Not Available
27
GAUG and FREE
Operating Modes
are also
described in
separate sections
of this manual.
SET MODES
Unless noted otherwise, features set apply to all Operating
Modes (NORM, GAUG, and FREE. FREE Dive Mode also has
several settings that do not affect NORM and GAUG Modes.
SURF MAIN > SET F > SET A > SET U > SET T > VT3 SN
Access and step through of the sequence is gained by repeated
simultaneous 2 second presses of the A and S buttons.
Alarms (Set A), Utilities (Set U), and Time (Set T) Set Points can
also be set/changed using the PC Settings Upload program.
FO2 (Set F) entries must be made using only the push buttons.
SET F GROUP (FO2)
Set F Sequence:
28
Fig. 20 - Set F (FO2)
SET F > FO2 GAS1 > FO2 GAS2 > FO2 GAS3 > FO2 Default.
> Depressing the A and S buttons simultaneously for 2
seconds while the NORM or GAUG SURF MAIN screen is
displayed will access SET F identified by the graphic SETF
(Fig. 20).
> Pressing and releasing the A button momentarily (< 2
seconds) while SET F is displayed will advance to SET FO2
GAS 1 with the Set Point flashing.
Setting FO2 for NORM Nitrox Dives:
For each value of FO2, the Maximum Operating Depth (MOD) that can be achieved for
the PO2 Alarm Set Point limit previously set, will be displayed.
When the FO2 50% DEFAULT is set ON and FO2 GAS 1 is set for a numerical value, 10
minutes on the surface after that dive, the FO2 for GAS 1 will be displayed as 50 and
further dives will be calculated based on 50% O2 for oxygen calculations and 21% O2
for Nitrogen calculations (79% Nitrogen) unless the FO2 for GAS 1 is set before the dive.
FO2 for GAS 1 continues to reset to the FO2 50% DEFAULT after subsequent repetitive
dives until 24 hours elapse after the last dive, or the FO2 50% DEFAULT is turned OFF in
the Set FO2 50% DEFAULT ON/OFF MODE.
When the FO2 50% DEFAULT is set OFF, the VT3 will remain set at the last FO2 GAS 1
Set Points for that series of repetitive dives.
The default FO2 for GAS 1 each new dive Period is AIR.
When FO2 for GAS 1 is set for AIR, the calculations are the same as when it is set to an
FO2 of 21%. When FO2 for GAS 1 is set to AIR, it remains set for AIR until it is set for a
numerical FO2 value (21 to 50%).
When FO2 is set only to AIR, the O2 Bar Graph is not displayed at any time during a dive
or on the surface. PO2 values and/or warnings will not be displayed during the dive.
FREE Dive nitrogen calculations are based on AIR and not affected by these FO2 Settings.
29
Maximum Operating Depths affected by the PO2 limit set will not be displayed when FO2
for GAS 1 is set to AIR.
Internally, the VT3 keeps track of the oxygen loading so that if FO2 for GAS 1 is subsequently set for a numerical value, the oxygen loading for previous AIR dives will be accounted for in the next Nitrox dive (during that dive period and series of repetitive dives).
Once FO2 GAS 1 is set for a numerical value (21 to 50%) and a dive is made, the AIR
option is disabled until 24 hours elapse after the last dive. The AIR option will not be
displayed in Set FO2 GAS 1 until a full 24 hour Surface Interval has elapsed.
If FO2 for GAS 1 is set for 21%, it will remain set for 21% for that series of dives until set
for a higher numerical value.
If the FO2 50% DEFAULT is set OFF, FO2 for GAS 2 and 3 will remain at their respective
Set Points previously selected until they are changed. If the FO2 50% DEFAULT is set ON,
FO2 for GAS 2 and 3 will Default to 50% after the dive.
The VT3 is programmed to prevent FO2 for GAS 2 and 3 from being set at values lower
than the FO2 Set Point for GAS 1. GAS 2 and 3 can only be set to values equal to or
higher than the FO2 Set Points of GAS 1 and 2, respectively.
When setting FO2 for GAS 2 and 3, the lowest values available will be the Set Point of the
previous Gas set (e.g., If FO2 GAS 1 is set for 32%, FO2 for GAS 2 can only be set at
values from 32 to 100%. Likewise, FO2 for GAS 3 will depend on the setting for GAS 2.
30
SET FO2 GAS 1, information includes:
> Graphic GAS1
> PO2 Alarm Set Point with graphic PO2, if Nitrox
> Symbol FO2 and FO2 Set Point value, flashing
> Tank 1 icon representing GAS 1
> Symbol NITROX (if set for a numerical value).
> Max Depth allowed for the PO2 Alarm Set (if 21 to 50%)
 Depressing and holding the S button while the Set Point is
flashing will scroll the Set Points from AIR (Fig. 21) to 21
through 50% in 1% increments, at a rate of 8 per second.
 Hint: The scroll will stop when the button is released, or
momentarily at 32% (even if the button is held depressed).
 Pressing and holding the S button will resume the scroll from
32 (Fig. 22) through 50%, then stop at AIR (or 21%).
 Pressing and releasing the S button will advance FO2 in
increments of 1% per press of the button.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to SET FO2
GAS 2 with the Set Point flashing.
 Pressing and releasing the A button repeatedly (< 2
seconds each) will step through the other SET F screens.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert to the SET F screen.
 Depressing the M button for 2 seconds or if no button
action for 2 minutes will revert to NORM or GAUG SURF.
Fig. 21 - Set FO2 GAS 1
(AIR)
Fig. 22 - Set FO2 GAS 1
(Nitrox)
31
SET FO2 GAS 2, information includes:
> Graphic GAS2
> PO2 Alarm Set Point with graphic PO2
> Symbol FO2 and FO2 Set Point value, flashing
> Tank 2 icon representing GAS 2
> Symbol NITROX (if set for a numerical value).
> Max Depth allowed for the PO2 Alarm Set (if 21 to 100%)
 Depressing the S button while the FO2 Set Point is flashing will scroll the Set Point
from AIR to 21 through 100% in 1% increments, at a rate of 8 per second.
 The scroll will start at the FO2 GAS 1 Set Point and stop when the button is released,
or momentarily at 50% (Fig. 23), then 80% (even if the button is held depressed).
 Depressing the S button will resume the scroll through 100%, then stop at AIR (or 21
or the GAS 1 setting).
 Pressing and releasing the S button (< 2 seconds) will advance FO2 in increments of
1% per press of the button.
 Pressing and releasing the A button momentarily (< 2 seconds) will save the setting
and/or advance to SET FO2 GAS 3 with the Set Point flashing.
 Pressing and releasing the A button momentarily and
repeatedly (< 2 seconds) will step through the other SET F
screens.
 Depressing the A and S buttons simultaneously for 2 seconds
will save the setting and revert to the SET F screen.
 Depressing the M button for 2 seconds or if no button action
for 2 minutes operation will revert to the NORM or GAUG SURF
MAIN screen.
Fig. 23 - Set FO2 GAS 2
(50% O2)
32
SET FO2 GAS 3 information includes:
> Graphic GAS3
> PO2 Alarm Set Point with graphic PO2
> Symbol FO2 and FO2 Set Point value, flashing
> Tank 3 icon representing GAS 3
> Symbol NITROX (if set for a numerical value).
> Max Depth allowed for the PO2 Alarm Set (if 21 to 100%)
 Depressing the S button while the FO2 Set Point is flashing will scroll the Set Point
from AIR to 21 through 100% (Fig. 24) in 1% increments, at a rate of 8 per second.
 The scroll will start at the FO2 GAS 2 Set Point and stop when the button is released,
or momentarily at 50% then 80% (even if the button is held depressed).
 Depressing and holding the S button will resume the scroll through 100%, then stop at
AIR (or 21 or the GAS 2 setting).
 Pressing and releasing the S button (< 2 seconds) will advance FO2 in increments of
1% per press of the button.
 Pressing and releasing the A button momentarily (< 2 seconds) will save the setting
and/or advance to SET FO2 50% DEFAULT with the Set
Point flashing.
 Pressing and releasing the A button repeatedly (< 2
seconds each) will step through the other SET F screens.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert to the SET F screen.
 Depressing and holding the M button for 2 seconds or if no
button is pressed for a period of 2 minutes operation will
revert to the NORM or GAUG SURF MAIN screen.
Fig. 24 - Set FO2 GAS 3
(100% O2)
33
SET FO2 50% DEFAULT information includes (Fig. 25):
Fig. 25 - Set FO2 Default
> Graphics DFLT and 50
> Set Point graphic OFF (or ON), flashing.
> Symbols FO2 and NITROX.
 Pressing and releasing the S button (< 2 seconds) will
toggle between OFF and ON.
 Pressing and releasing the A button (< 2 seconds) will save
the setting and revert to the SET F screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to
the NORM or GAUG SURF MAIN screen.
SET A GROUP (NORM/GAUG ALARMS)
Set A Sequence:
Fig. 26 - Set A (Alarms)
34
SET A > Audible > Depth > EDT > TLBG > DTR > Turn Pressure >
End Pressure > PO2
> The SET A Group can also be set/changed using the PC
Settings Upload program.
> SET A items do not strike Alarms in FREE Dive Mode.
> SET A Settings remain at the values set until changed.
> Depressing the A and S buttons simultaneously for 4
seconds while NORM or GAUG SURF MAIN is displayed
will access SET A identified by the graphic SETA (Fig. 26).
> Pressing and releasing the A button momentarily (< 2 seconds) while SET A is
displayed will advance to SET AUDIBLE ALARM with the Set Point flashing.
SET AUDIBLE ALARM
This option allows the Audible Alarms and the associated red warning LED function to be
disabled.
Some cautionary situations will cause the Audible Alarm to sound and the LED to flash
even if this feature is set to OFF.
SET AUDIBLE ALARM information includes (Fig. 27):
> Graphic AUD
> Set Point graphic ON (or OFF), flashing.
 Pressing and releasing the S button (< 2 seconds) will toggle between ON and OFF.
 Pressing and releasing the A button momentarily (< 2 seconds) will save the setting
and/or advance to the SET DEPTH ALARM screen with the Set Point flashing.
 Pressing and releasing the A button repeatedly (< 2 seconds each) will step through
the other SET A screens.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert to the SET A screen.
 Depressing the M button for 2 seconds or if no button
action for 2 minutes operation will revert to the NORM or
GAUG SURF MAIN screen.
Fig. 27 - Set Audible Alarm
35
SET DEPTH ALARM information includes (Fig. 28):
Fig. 28 - Set Depth Alarm
36
> Graphic DPTH
> Symbols MAX and FT (or M)
> Set Point graphic value, flashing.
 Pressing and releasing the S button momentarily (< 2
seconds) will step through the Set Points from 30 to 330 FT
(10 to 100 M) in 10 FT (1 M) increments at a rate of 1 Set
Point per press of the button.
 Depressing and holding the S button will scroll through the
Set Points at a rate of 4 Set Points per second until it is
released.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to the SET
EDT (Elapsed Dive Time) ALARM screen with the Set Point
flashing.
 Pressing and releasing the A button momentarily and
repeatedly (< 2 seconds each time) will step through the
other SET A screens.
 Pressing the A and S buttons simultaneously for 2 seconds
will save the setting and revert to the SET A screen.
 Depressing and holding the M button for 2 seconds or if no
button is pressed for a period of 2 minutes operation will
revert to the NORM or GAUG SURF MAIN screen.
FREE Mode has separate Depth Alarms.
SET EDT (ELAPSED DIVE TIME) ALARM
Information includes (Fig. 29):
> Graphic EDT
> Symbols DIVE and TIME.
> Set Point value (hr:min), flashing.
 Pressing and releasing the S button momentarily (< 2
seconds) will increase the Set Point from 0:10 to 3:00
(hours:minutes) in 5 minute (:05) increments.
 Depressing the S button will scroll through the Set Points at
a rate of 4 Set Points per second until it is released.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to the SET
TLBG (Tissue Loading Bar Graph) ALARM screen with the
Set Point flashing.
 Pressing and releasing the A button repeatedly (< 2
seconds each) will step through the other SET A screens.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert to the SET A screen.
 Depressing he M button for 2 seconds or if no button is
pressed for 2 minutes operation will revert to the NORM or
GAUG SURF MAIN screen.
FREE Mode has a separate EDT Alarm.
Fig. 29 - Set EDT Alarm
37
SET TLBG (TISSUE LOADING BAR GRAPH) ALARM
Setting the TLBG
Information includes (Fig. 30):
Alarm to activate
Graphic TLBG
before the VT3 enters >> TLBG
Set Point (segments), flashing.
DECO is highly
recommended.
 Pressing and releasing the S button momentarily (< 2
seconds) will decrease the Set Point from All 8 segments
(Deco) to 1 in decrements of 1 segment.
 Depressing the S button will scroll through the Set Points at
a rate of 4 Set Points per second until it is released.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to the SET
DTR (Dive Time Remaining) ALARM screen with the Set
Point flashing.
 Pressing and releasing the A button repeatedly (< 2
seconds each) will step through the other SET A screens.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert to the SET A screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to
the NORM or GAUG SURF MAIN screen.
FREE Mode has a separate TLBG Alarm.
Fig. 30 - Set TLBG Alarm
38
SET DTR (DIVE TIME REMAINING) ALARM
Information includes (Fig. 31):
> Graphic DTR
> Symbols AIR, TIME, NDC, and O2.
> Set Point value, flashing.
 Pressing and releasing the S button momentarily (< 2
seconds) will increase the Set Point from 0:00 to 0:20
(:minutes) in 1 minute (0:01) increments.
 Depressing the S button will scroll through the Set Points at
a rate of 4 Set Points per second until it is released.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to the SET
TURN PRESSURE ALARM screen with the Set Point flashing.
 Pressing and releasing the A button momentarily and
repeatedly (< 2 seconds each) will step through the other
SET A screens.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert o the SET A screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to
the NORM or GAUG SURF MAIN screen.
Whichever Time (No
Decompression, O2,
or Air Time Remaining) decreases to the
Alarm Set Point will
activate the Alarm.
Fig. 31 - Set DTR Alarm
39
SET TURN PRESSURE ALARM (for Transmitter 1 only)
Information includes (Fig. 32):
> Graphic TURN
> Set Point OFF or a numeric value, flashing.
> Symbol PSI (or M)
 Pressing and releasing the S button momentarily (< 2
seconds) will step through the Set Points from OFF to 1000
to 3000 PSI (70 to 205 BAR) in 250 PSI (5 BAR)
increments.
 Depressing the S button will scroll through the Set Points at
a rate of 4 Set Points per second until it is released.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to the SET
END PRESSURE ALARM screen with the Set Point flashing.
 Pressing and releasing the A button repeatedly (< 2
seconds each) will step through the other SET A screens.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert to the SET A screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to
the NORM or GAUG SURF MAIN screen.
Fig. 32 - Set Turn Alarm
40
SET END PRESSURE ALARM information includes (Fig. 33):
> Graphic END
> Set Point numeric value, flashing.
> Symbol PSI (or M)
 Pressing and releasing the S button momentarily (< 2
seconds) will increase the Set Point from 300 to 1500 PSI
(20 to 105 BAR) in 100 PSI (5 BAR) increments.
 Depressing the S button will scroll through the Set Points at a
rate of 4 Set Points per second until it is released.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to the SET
PO2 ALARM screen with the Set Point flashing.
 Pressing and releasing the A button repeatedly (< 2 seconds
each) will step through the other SET A screens.
 Depressing the A and S buttons simultaneously for 2 seconds
will save the setting and revert to the SET A screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to the
NORM or GAUG SURF MAIN screen.
The END PRESSURE
Alarm will activate
when Pressure in the
Tank (TMT 1, 2 , or
3) being used at the
time decreases to the
Alarm Set Point.
Fig. 33 - Set End Alarm
41
Setting the PO2
Alarm to activate
before reaching the
Max allowed limit of
1.60 ATA is highly
recommended.
Fig. 34 - Set PO2 Alarm
42
SET PO2 ALARM information includes (Fig. 34):
> Graphics PO2 and AtA
> Set Point value, flashing.
> Symbol MAX
 Pressing and releasing the S button momentarily (< 2
seconds) will increase the Set Point from 1.20 (ATA) to 1.60
(ATA) in .10 (ATA) increments.
 Depressing the S button will scroll through the Set Points at
a rate of 4 Set Points per second until it is released.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to the SET A
screen.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert to the SET A screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to
the NORM or GAUG SURF MAIN screen.
SET U GROUP (UTILITIES)
Set U Sequence:
SET U > Wet Activation > Units > Safety Stop > Conservative
Factor > Backlight Duration > Sampling Rate > TMT 1 > TMT 2-3
USE > TMT 2 (or BUD 1) > TMT 3 (or BUD 2).
> The SET U Group can also be set/changed using the PC
Settings Upload program.
> SET U Settings remain at the values set until changed.
> FREE Mode utilizes these settings for Wet Activation, Units,
and Backlight Duration. It has a separate Sampling Rate
fixed at a 1 second interval not affected by the SET U
setting.
> Depressing the A and S buttons simultaneously for 6
seconds while the NORM or GAUG SURF MAIN screen is
displayed, will access SET U identified by the graphic SETU
(Fig. 35).
> Pressing and releasing the A button momentarily (< 2
seconds) while SET U is displayed will advance to SET WET
ACTIVATION with the Set Point flashing.
TMT is the abbreviation
used for Transmitter.
BUD is the abbreviation
used for Buddy.
Fig. 35 - SET U (Utilities)
43
SET WET ACTIVATION information includes (Fig. 36):
> Graphic WET
> Set Point graphic ON (or OFF) flashing.
 Pressing and releasing the S button will toggle between ON
and OFF.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to the SET
UNITS screen with the Set Point flashing.
 Pressing and releasing the A button repeatedly (< 2
seconds each) will step through the other SET U screens.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert to the SET U screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to
the NORM or GAUG SURF MAIN screen.
HINT: To change this setting while operating in
FREE Mode, first access the NORM SURF Mode.
Fig. 36 - Set Wet Activation
44
SET UNITS information includes (Fig. 37):
> Graphic UNIT
> Set Point symbols/graphics PSI, F, and FT (or BAR, C, and
M), flashing.
 Pressing and releasing the S button will toggle between
Imperial (F, FT, PSI) and Metric (C, M, BAR).
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to the SET
SAFETY STOP screen with the Time Set Point flashing.
 Pressing and releasing the A button repeatedly (< 2
seconds each) will step through the other SET U screens.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert to the SET U screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to
the NORM or GAUG SURF MAIN screen.
HINT: To change this setting while operating in
FREE Mode, first access the NORM SURF Mode.
Fig. 37 - Set Units
45
SET NORM SAFETY STOP information includes (Fig. 38):
> Graphic SAFE
> Symbols STOP and TIME.
> Safety Stop Time Set Point, flashing.
> Safety Stop Depth Set Point and symbol FT (or M).
 Pressing and releasing the S button momentarily (< 2 seconds each) will step through
the Stop Time Set Points of OFF, 3:00, and 5:00 (minutes:seconds).
 Pressing and releasing the A button momentarily (< 2 seconds) will save the Stop Time
setting and the Stop Depth Set Point will flash, or if Stop Time is set OFF advance to
the SET CONS (Conservative Factor) screen with the Set Point flashing.
 Pressing and releasing the S button momentarily (< 2 seconds each) will step through
the Stop Depth Set Points of 10, 15, and 20 FT (or 3, 4, 5, and 6 M).
 Pressing and releasing the A button momentarily (< 2 seconds) will save the Safety
Stop settings and/or advance to the SET CONS screen with the Set Point flashing.
 Pressing the A button repeatedly (< 2 seconds) will step through the other SET U
screens.
 Depressing the A and S buttons simultaneously for 2 seconds
will save the settings and revert to the SET U screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to the
NORM or GAUG SURF MAIN screen.
Fig. 38 - Set Safety Stop
46
SET CONSERVATIVE FACTOR information includes (Fig. 39):
> Graphic CONS
> Set Point ON (or OFF), flashing.
> Symbols TIME and NDC.
 Pressing and releasing the S button (< 2 seconds) will
toggle between ON and OFF.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to the SET
BACKLIGHT DURATION screen with the Set Point flashing.
 Pressing and releasing the A button repeatedly (< 2
seconds each) will step through the other SET U screens.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert to the SET U screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to
the NORM or GAUG SURF MAIN screen.
NOTE: When the Conservative Factor is set ON,
the No Decompression Limit dive times are reduced to values equivalent to those that would
be available at the next higher 3000 foot (915
meter) Altitude. Refer to the tables on Pages
150/151.
Fig. 39 - Set Conservative
Factor
47
SET BACKLIGHT DURATION information includes (Fig. 40):
> Graphic GLO.
> Symbol TIME.
> Set Point, flashing.
 Pressing and releasing the S button momentarily (< 2
seconds each) will step through the Set Points of :00, :05,
and :10 (seconds).
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to the SET
SAMPLING RATE screen with the Set Point flashing.
 Pressing and releasing the A button repeatedly (< 2
seconds each) will step through the SET U screens.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert to the SET U screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to the
NORM or GAUG SURF MAIN screen.
HINT: To change the Backlight Duration while
operating in FREE Mode, first access the NORM
SURF Mode.
48
Fig. 40 - Set Backlight
Duration
SET SAMPLING RATE information includes (Fig. 41):
> Graphic SAMP
> Symbol TIME.
> Set Point, flashing.
 Pressing and releasing the S button momentarily (< 2
seconds) will step through the Set Points of :02, :15, :30,
:60 (seconds).
 Depressing the S button will scroll through the Set Points at
a rate of 4 Set Points per second until it is released.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the setting and/or advance to the SET
TMT 1 screen with the Set Point flashing.
 Pressing and releasing the A button repeatedly (< 2
seconds each) will step through the other SET U screens.
 Depressing the A and S buttons simultaneously for 2
seconds shall save the setting and revert to the SET U
screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to
the NORM or GAUG SURF MAIN screen.
SAMPLING RATE is
the frequency (time
interval) at which
data is sampled and
stored in memory for
subsequent download to the PC
OceanLog program.
NOTE: FREE Mode has a separate fixed Sampling Rate of 1 second.
Fig. 41 - Set Sampling Rate
49
TMT is the abbreviation for Transmitter.
50
Fig. 42 - Set TMT 1
SET TMT 1 information includes (Fig. 42):
> Graphics TMT1 and ON (or OFF) flashing.
> Set Point (Transmitter's Serial Number (Link Code).
 Pressing and releasing the S button momentarily (< 2
seconds) will toggle between ON and OFF.
 Pressing and releasing the A button momentarily (< 2
seconds) will accept the ON/OFF selection.
 If OFF is selected, SET TMT 2-3 USE , SET TMT 2 (or BUD
1), and TMT 3 (or BUD 2) will be bypassed and operation
will revert to the SET U screen.
 If ON is selected, the first (left) digit of the Code will flash.
 Pressing and releasing the S button repeatedly (< 2 seconds
each) will increase the First Digit from 0 to 9 in increments
of 1.
 Depressing the S button will scroll through the Set Points at
a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will
accept the First Digit of the Code and/or advance to the
Second Digit which will be flashing.
 Pressing and releasing the S button will increase the Second
Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at
a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will accept the Second Digit of the
Code and/or advance to the Third Digit which will be flashing.
 Pressing and releasing the S button repeatedly (< 2 seconds each) will increase the
Third Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will accept the Third Digit of the
Code and/or advance to the Fourth Digit which will be flashing.
 Pressing and releasing the S button repeatedly (< 2 seconds each) will increase the
Fourth Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will accept the Fourth Digit of the
Code and/or advance to the Fifth Digit which will be flashing.
 Pressing and releasing the S button repeatedly (< 2 seconds each) will increase the
Fifth Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at a rate of 4 per second.
 Pressing and releasing the A button will accept the Fifth Digit of the Code and/or
advance to the Sixth Digit which will be flashing.
 Pressing and releasing the S button repeatedly (< 2 seconds each) will increase the
Sixth Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will accept the TMT 1 Link Code
and/or advance to SET TMT 2-3 USE with the Set Point flashing.
 Depressing the A and S buttons simultaneously for 2 seconds will save the setting and
revert back to the SET U screen.
51
SET TMT 2-3 USE information includes (Fig. 43):
> Graphics TMT and 2-3 USE.
> Set Point graphic SELF (or bud) flashing.
 Pressing and releasing the S button momentarily (< 2
seconds) will toggle between SELF and bud.
 Pressing and releasing the A button momentarily (< 2
seconds) will accept the setting and/or advance to SET
TMT 2 (or BUD 1) with ON or OFF flashing.
 Depressing the A and S buttons simultaneously for 2
seconds will save the setting and revert to the SET U
screen.
 Depressing the M button for 2 seconds or if no button is
pressed for a period of 2 minutes operation will revert to
the NORM or GAUG SURF MAIN screen.
When set for SELF, TMT 2 and TMT 3 are associated with
Transmitters to be used by the diver using the VT3 for Gas
Switching.
When set for BUD, TMT 1 is associated with the user of the VT3
and TMT 2 and TMT 3 are associated with Transmitters to be
used by other divers (Buddies) whose Pressure can be checked
by the user of the VT3.
Fig. 43 - Set TMT 2-3 Use
52
SET TMT 2 (or BUD 1) information includes (Fig. 44):
> Graphics TMT2 (or BUD1) and ON (or OFF) flashing.
> Set Point (Transmitter's Serial Number (Link Code).
 Pressing and releasing the S button momentarily (< 2
seconds) will toggle between ON and OFF.
 Pressing and releasing the A button momentarily (< 2
seconds) will accept the ON/OFF selection.
 If OFF is selected, SET TMT 3 (or BUD 2) will be bypassed
and the operation will revert to the SET U screen.
 If ON is selected, the first (left) digit of the Code will flash.
 Pressing and releasing the S button repeatedly (< 2 seconds
each) will increase the First Digit from 0 to 9 in increments
of 1.
 Depressing the S button will scroll through the Set Points at
a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will
accept the First Digit of the Code and/or advance to the
Second Digit which will be flashing.
 Pressing and releasing the S button will increase the Second
Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at
a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will
accept the Second Digit of the Code and/or advance to the
Third Digit which will be flashing.
If TMT 2-3 USE is set for
SELF (Gas Switching)
- OR -
If TMT 2-3 USE is set for
Buddy Pressure Check
Fig. 44 - Set TMT 2 or BUD 1
53
 Pressing and releasing the S button repeatedly (< 2 seconds each) will increase the
Third Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will accept the Third Digit of the
Code and/or advance to the Fourth Digit which will be flashing.
 Pressing and releasing the S button repeatedly (< 2 seconds each) will increase the
Fourth Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will accept the Fourth Digit of the
Code and/or advance to the Fifth Digit which will be flashing.
 Pressing and releasing the S button repeatedly (< 2 seconds each) will increase the
Fifth Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at a rate of 4 per second.
 Pressing and releasing the A button will accept the Fifth Digit of the Code and/or
advance to the Sixth Digit which will be flashing.
 Pressing and releasing the S button repeatedly (< 2 seconds each) will increase the
Sixth Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will accept the TMT 2 (or BUD 1)
Link Code and/or advance to SET TMT 3 (or BUD 2) with ON or OFF flashing.
 Depressing the A and S buttons simultaneously for 2 seconds will save the setting and
revert to the SET U screen.
54
SET TMT 3 (or BUD 2) information includes (Fig. 45):
> Graphics TMT3 (or BUD2), and ON (or OFF) flashing.
> Set Point (Transmitter's Serial Number (Link Code)).
 Pressing and releasing the S button momentarily (< 2
seconds) will toggle between ON and OFF.
 Pressing and releasing the A button momentarily (< 2
seconds) will accept the ON/OFF selection.
 If OFF is selected, operation reverts to the SET U screen.
 If ON is selected, the first (left) digit of the Code will flash.
 Pressing and releasing the S button repeatedly (< 2 seconds
each time) will increase the First Digit from 0 to 9 in
increments of 1.
 Depressing the S button will scroll through the Set Points at
a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will
accept the First Digit of the Code and/or advance to the
Second Digit which will be flashing.
 Pressing and releasing the S button will increase the Second
Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at
a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will
accept the Second Digit of the Code and/or advance to the
Third Digit which will be flashing.
If TMT 2-3 USE is set for
SELF (Gas Switching)
- OR -
If TMT 2-3 USE is set for
Buddy Pressure Check
Fig. 45 - Set TMT 3
55
 Pressing and releasing the S button repeatedly (< 2 seconds each) will increase the
Third Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will accept the Third Digit of the
Code and/or advance to the Fourth Digit which will be flashing.
 Pressing and releasing the S button repeatedly (< 2 seconds each) will increase the
Fourth Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will accept the Fourth Digit of the
Code and/or advance to the Fifth Digit which will be flashing.
 Pressing and releasing the S button repeatedly (< 2 seconds each) will increase the
Fifth Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at a rate of 4 per second.
 Pressing and releasing the A button will accept the Fifth Digit of the Code and/or
advance to the Sixth Digit which will be flashing.
 Pressing and releasing the S button repeatedly (< 2 seconds each) will increase the
Sixth Digit from 0 to 9 in increments of 1.
 Depressing the S button will scroll through the Set Points at a rate of 4 per second.
 Pressing and releasing the A button (< 2 seconds) will accept TMT 3 (or BUD 2) Link
Code and/or advance to the SET U screen.
56
SET T GROUP (TIME/DATE)
Set T Sequence:
SET T > Hour Format > Hour > Minute > Year > Month > Day
> The SET T Group can also be set/changed using the PC
Settings Upload program.
> SET T Settings remain at the values set until changed.
> FREE Mode utilizes these settings.
> Day of the Week is set automatically when the Date is set.
 Depressing the A and S buttons simultaneously for 8
seconds while the NORM or GAUG SURF MAIN screen is
displayed, will access SET T identified by the graphic SETT
(Fig. 46).
 Depressing the M button at any time for 2 seconds and if no
button is pressed during a period of 2 minutes, the unit will
revert to the NORM or GAUG SURF MAIN screen.
 Pressing and releasing the A button momentarily (< 2
seconds) while SET T is displayed will advance to SET
HOUR FORMAT with the Set Point flashing.
The YEAR will not be
displayed in any
Mode other than
SET DATE. The
DATE will reset to
1.1 2006 when the
Battery is replaced.
Fig. 46 - Set T
57
SET HOUR FORMAT information includes (Fig. 47):
Fig. 47 - Set Hour Format
> Graphic HOUR
> Set Point 12 (or 24), flashing.
> Symbol TIME.
 Pressing and releasing the S button momentarily (< 2
seconds) will toggle between 12 and 24.
 Pressing the A button momentarily (< 2 seconds) will save
the Hour Format Set Point and access the SET TIME screen
with the HOUR Set Point flashing (Fig. 48).
 HINT - Pressing the A button repeatedly (< 2 seconds each)
will step through the Time/Date Settings, bypassing those
that don't require setting.
SET TIME (Hour and Minute)
The graphic Am or Pm will be displayed when 12 Hour Format
has been selected.
 Depressing the S button while the HOUR Set Point is
flashing will scroll through the Set Points in 1 Hour
increments at a rate of 4 per second from 12: Am to 11:
Pm (or 0: to 23: if set for 24 Hour Format).
 Pressing and releasing the A button momentarily (< 2
seconds) will save the Hour Set Point and/or advance to
SET MINUTE with the MINUTE Set Point flashing.
58
Fig. 48 - Set Time
 Depressing the S button while the MINUTE Set Point is flashing will scroll through the
Set Points in 1 minute increments at a rate of 4 per second from :00 to :59.
 Pressing and releasing the A button momentarily (< 2 seconds) will save the Minute
Set Point and/or advance to the SET DATE screen.
SET DATE (Year, Month, and Day)
Displayed will be the graphic YEAR, Month and Day (or Day and Month if set for metric)
with the YEAR Set Point flashing (Fig. 49).
 Depressing the S button will scroll through the YEAR Set Points in 1 year increments at
a rate of 4 per second from 2006 to 2049 (with leap year corrections).
 Pressing and releasing the A button momentarily (< 2 sec) will save the Year Set Point
and/or advance to SET MONTH with the Set Point flashing and the graphic MNTH
replacing the graphic YEAR.
 Depressing the S button will scroll through the MONTH Set Points in 1 month
increments at a rate of 4 per second from 1 to 12.
 Pressing and releasing the A button momentarily (< 2 seconds) will save the Month
Set Point and/or advance to SET DAY with the Set Point
flashing and the graphic DAY (replacing the graphic
MNTH.
 Depressing the S button will scroll through the DAY Set
Points in one day (01) increments at a rate of 4 per second
from 1 to 31.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the Set Point and/or advance to the SE T
screen.
Fig. 49 - Set Date
59
SERIAL NUMBER (VT3)
 Depressing the A and S buttons simultaneously for 10
seconds while viewing the NORM or GAUG SURF MAIN
screen will access the VT3's SERIAL NUMBER screen
displaying (Fig. 50):
> Graphic SN
> Factory programmed Serial Number of the VT3.
> Firmware revision number (e.g., graphic r1A).
 Depressing the A and S buttons simultaneously for 2
seconds will revert to the SURF MAIN screen.
 Depressing the M button for 2 seconds will revert to the
SURF MAIN screen.
 If no button is pressed during a period of 2 minutes, the unit
will revert to the SURF MAIN screen.
NOTE: The Serial Number and Firmware Revision will be requested in the event that you
contact Oceanic regarding your VT3. Enter them
in the Records section provided in the back of
this Manual.
Fig. 50 - SERIAL NUMBER
(of the VT3)
60
NORM SURF ALT, information includes (Fig. 51):
> Day of the Week graphic (SAT, SUN, MON, TUE, WED,
THU, FRI).
> Temperature with degree icon and graphic F (or C)
> Time of Day (hour:minute).
 Pressing and releasing the A button momentarily (< 2
seconds) will access the NORM PLAN Lead-in screen.
 Pressing the S button will activate the Backlight.
 The display will revert to the NORM SURF MAIN screen if
the M button is pressed for 2 seconds or after 5 seconds
with no M or A button action.
NORM PLAN MODE
Oceanic strongly recommends that you review the
Pre Dive Planning Sequence (PDPS) prior to every
NORM dive to help you Plan your dive as required to
avoid exceeding no decompression or oxygen exposure limits. This is especially important for repetitive dives
when the PDPS indicates adjusted dive times that are available
for the next dive, based on residual nitrogen or oxygen accumulation (whichever is in control) following the last dive and surface
interval.
Fig. 51 - NORM SURF ALT
61
DEPTH
FT (M)
30 (9)
40 (12)
50 (15)
60 (18)
70 (21)
80 (24)
90 (27)
100 (30)
110 (33)
120 (36)
130 (39)
140 (42)
150 (45)
160 (48)
170 (51)
180 (54)
190 (57)
NDL
HR:MIN
4:20 (4:43)
2:17 (2:24)
1:21 (1:25)
:57
(:59)
:40
(:41)
:30
(:32)
:24
(:25)
:19
(:20)
:16
(:17)
:13
(:14)
:11
(:11)
:09
(:09)
:08
(:08)
:07
(:07)
:07
(:06)
:06
(:06)
:05
(:05)
NDLs, AIR Dive at Sea
Level (no dive made yet)
Refer to the charts on
pages 150 and 151
for complete listings of
No Decompression
Limits for Sea Level and
Altitudes up to 14,000
feet (4,270 meters).
62
NOTE: No Decompression Dive Times in NORM
PLAN MODE are based on the FO2 setting for
GAS 1. The FO2 settings for GAS2 and GAS3
are not utilized for Plan calculations.
 Pressing and releasing the A button momentarily (< 2
seconds) 1 time while the NORM SURF MAIN screen is
displayed will access the PLAN MODE Lead-in screen
(NORM SURF > PLAN Lead-in).
 While in the PLAN MODE, pressing and releasing the S
button repeatedly (< 2 seconds each time) will increase the
Planned Depth in increments of 10 FT (3 M), displaying the
information one screen at a time.
Information provided includes Depths and allowable No Decompression Dive Times. The screens will sequence through Depths
from 30 to 190 FT (9 to 57 M), or the Maximum Depth that will
allow theoretical No Decompression Dive Time of at least 1
minute based upon the previous dive profiles in a series of
repetitive dives and taking into account descent and ascent rates
of 60 FPM (18 MPM).
NOTE: When the Conservative Factor is set ON,
No Decompression Dive times are reduced to the
values of the next 3000 foot (915 meter) higher
Altitude.
If FO2 for GAS1 is set for a numerical value (21 to 50%), the NITROX graphic and Maximum Operating Depth defined by the PO2 ALARM Set Point will be displayed.
If the limiting time factor is Oxygen controlled, the symbols TIME and O2 will be displayed. If the limiting time factor is Nitrogen controlled, the symbols TIME and NDC will
be displayed.
 Prior to a first dive of a series, pressing and releasing the A
button momentarily (< 2 seconds) will advance to LOG
MODE.
 After a dive is made, it will advance to FLY MODE.
 Depressing the M button for 2 seconds, or if no button is
pressed during a 2 minute period, operation will revert to
the NORM SURF MAIN screen.
PLAN MODE LEAD-IN information includes (Fig. 52A/B):
> Graphic PLAN.
> PO2 Alarm Set Point and graphic PO2, if set for Nitrox.
> FO2 icon and FO2 Set Point for GAS 1.
> Tank 1 icon representing GAS 1.
> Symbol NITROX, if set for Nitrox.
 Press and release the S button momentarily (< 2 seconds) to
access the first screen (30 FT/9 M) of the Pre Dive Planning
Sequence (PDPS).
Fig. 52A - PLAN LEAD-IN
(FO2 set for AIR)
Fig. 52B - PLAN LEAD-IN
(FO2 set for 32%)
63
PDPS information includes (Fig. 53A/B):
Fig. 53A - PDPS
(Nitrogen controlled)
> Plan Depth values and symbol F (feet) or M (meters).
> PO2 Alarm Set Point and graphic PO2, if set for Nitrox.
> Symbols TIME and NDC (or O2 if in control).
> Dive Time (HR:MIN) allowed for the FO2 set for GAS 1.
> Tank 1 icon representing GAS 1.
> Symbol NITROX, if set for a Nitrox dive.
> Maximum Depth allowed and symbols MAX and FT (or M).
 Press and release the S button momentarily and repeatedly
(< 2 seconds each time) to increase the Planned Depth in
increments of 10 FT (3 M), displaying the information one
screen at a time.
 Depressing and holding the M button for 2 seconds to
revert to the NORM SURF MAIN screen.
FLY MODE
64
Fig. 53B - PDPS
(O2 controlled)
Time to Fly is a counter that begins counting down 10 minutes
after surfacing from a dive from 23:50 to 0:00 (hr:min).
Two hours after a NORM or FREE dive, the FLY screen will
alternate with the SAT screen until the VT3 shuts Off 24 hours
after the last dive. When operating in FREE Mode, the FLY
screen can be viewed by first accessing the NORM SURF MAIN
screen.
During the first 2 hours after a dive  pressing and releasing the A button 3 times momentarily (<
2 seconds each time) while the NORM SURF MAIN screen
is displayed will access FLY MODE (NORM SURF MAIN >
ALT > PLAN > FLY, or  pressing and releasing the A button 2 times momentarily (<
2 seconds each) while the GAUG SURF MAIN screen is
displayed will access FLY MODE (GAUG SURF MAIN >
ALT > FLY).
TIME TO FLY information includes (Fig. 54):
> Graphic FLY and symbol TIME.
> Countdown Time (hr:min).
> Battery icon if a VT3 Low Battery Warning Condition exists,
flashing if Too Low
 Pressing and releasing the A button momentarily (< 2
seconds) will advance to SAT MODE.
 Depressing the M button for 2 seconds will revert to the
NORM or GAUG SURF MAIN screen.
 If no button is pressed during a 2 minute period, operation
will revert to the NORM or GAUG SURF MAIN screen.
 Pressing the S button will activate the Backlight.
Fig. 54 - Time to Fly
65
SAT MODE
The Time to Desaturate counter provides calculated time for Tissue Desatuation at sea level
taking into consideration the Conservation Factor setting. It begins counting down 10
minutes after surfacing from a dive, counting down from 23:50 max to 0:00 (hr:min).
When the Countdown reaches 0:00, which will generally occur prior to the FLY countdown reaching 0:00, the SAT screen continues to alternate with FLY displaying 0:00 until
the FLY counter shuts the VT3 Off 24 hours after a last dive.
> The SAT screen is not displayed after a Violation Dive.
> Desaturation requiring Times greater than 24 hours will display 23: - - .
> In the event that Time to Desaturate still remains at the end of 24 hours, the added
time will be zeroed.
During the first 2 hours after a dive  pressing and releasing the A button 4 times momentarily (< 2 seconds each time)
while the NORM SURF MAIN screen is displayed will access SAT MODE (NORM
SURF MAIN > ALT > PLAN > FLY > SAT, or  the SAT screen is not accessible from GAUG SURF MAIN.
Two hours after a NORM or FREE dive, the SAT screen will alternate with the FLY screen
until the VT3 shuts Off 24 hours after the last dive. When operating in FREE Mode, the
SAT screen can be viewed by first accessing the NORM SURF MAIN screen.
66
TIME TO DESAT information includes (Fig. 55):
> Graphic SAT and symbol TIME.
> Countdown Time (hr:min).
> Battery icon (if an VT3 Low Battery Warning Condition
exists), flashing if Too Low
 Pressing and releasing the A button momentarily (< 2
seconds) will advance to LOG MODE.
 Depressing the M button for 2 seconds will revert to the
NORM or GAUG SURF MAIN screen.
 If no button is pressed during a 2 minute period, the unit
will revert to the NORM or GAUG SURF MAIN screen.
 Pressing the S button will activate the Backlight.
NORM/GAUG LOG MODE
LOG MODE displays information from the latest 24 NORM/
GAUG dives sequentially in reverse order (the most recent first).
LOG information is retained until deleted by another dive.
> After exceeding 24 dives, the most recent Dive completed
will be added to the LOG and the oldest deleted.
Battery removal will not affect the LOG data stored for viewing.
Fig. 55 - Time to Desat
67
Dives will be numbered 1 to 24 starting at #1 each time a new series of dives begins.
After it shuts Off 24 hours after a dive, the first dive of the next new series will be #1.
Accessing LOG Mode:
 During the first 10 minutes after a dive, pressing and releasing the A button
momentarily (< 2 seconds) 1 time while the NORM or GAUG SURF MAIN screen is
displayed will access LOG MODE. (NORM or GAUG SURF MAIN > LOG)
 10 minutes after a Non Violation Dive, pressing and releasing the A button 5 times (<
2 seconds each time) while the NORM SURF MAIN screen is displayed will access
the LOG MODE (NORM SURF MAIN > PLAN > FLY > SAT > LOG), or > pressing and releasing the A button 2 times (< 2 seconds each time) while the GAUG
SURF MAIN screen is displayed will access the LOG MODE (GAUG SURF MAIN >
FLY > LOG).
 10 minutes after a Violation Dive, pressing and releasing the A button 23 times (< 2
seconds each time) while the NORM or GAUG SURF MAIN screen is displayed will
access the LOG MODE (NORM or GAUG SURF MAIN > FLY LOG). PLAN and SAT
screens will not be available after a Violation Dive.
Upon accessing LOG MODE, the most recent NORM or GAUG dive’s LOG PREVIEW
screen will be displayed.
 Depressing the S button for 2 seconds will display the previous dive’s PREVIEW
screen. Subsequent presses of S will step through other previous dives' PREVIEW
screens.
68
 Pressing and releasing the S button momentarily (< 2 seconds) while viewing a
PREVIEW screen will display that dive’s LOG DATA 1 screen (Nitrogen Data).
 If that was a Nitrox dive, pressing and releasing the S button again will display that
dive’s LOG DATA 2 screen (Oxygen Data). If in GAUGE MODE (Violated or User
Selected), this screen will not be displayed.
 LOG screens remain on display until further button action occurs.
 Once the S button is pressed, pressing and releasing the A button momentarily (< 2
seconds) button will revert to NORM or GAUG SURF MAIN screen.
 Depressing and holding the M button for 2 seconds or if no button is pressed during a
2 minute period operation will revert to the NORM or GAUG SURF MAIN screen.
 Pressing the S button will activate the Backlight.
LOG PREVIEW screen information includes (Fig. 56):
> Graphic LOG.
> Date (month.day, or day.month if set for metric).
> Symbol DIVE and dive number (1 to 24) for that series.
> Time of Day the dive began (hr:min) with graphic Am/Pm if
set for 12 Hour Format.
> Symbol NITROX if a Nitrox dive, none if a NORM AIR, or
GAUG dive.
 Pressing and releasing the S button momentarily (< 2
seconds) button will advance to the LOG DATA 1 screen.
 Pressing and holding the S button will scroll through the
previous Log Preview screens.
Fig. 56 - LOG PREVIEW
69
LOG DATA 1 information includes (Fig. 57):
> Alpha graphic NO-D, DECO, GAUG, or VIOL.
> TLBG with the maximum accumulation segment flashing,
others fixed up to end-of-dive accumulation. All segments
flashing for delayed and full violation.
> VARI - showing the maximum ascent rate maintained for 4
consecutive seconds during the dive.
> Temperature (minimum recorded that dive) and graphic F
(or C).
> Symbols DIVE and TIME and Elapsed Dive Time (hr:min).
> Symbols TIME and SURFACE.
> Pre-dive Surface Interval (hr:min), 10 - through 23 - for times
greater than 9:59 (hr:min), blank for Dive 1 of a series.
> Maximum Depth and symbols MAX and FT (or M).
> Symbol NITROX, if a NORM Nitrox dive, none if a NORM
AIR or GAUG dive.
 Pressing and releasing the S button momentarily (< 2
seconds) button will advance to the LOG DATA 2 screen.
 Depressing the M button for 2 seconds or if no button is
pressed during a 2 minute period operation will revert to
the NORM or GAUG SURF MAIN screen.
 Pressing the S button will activate the Backlight.
Fig. 57 - LOG DATA 1
70
LOG DATA 2 (if a Nitrox dive) information includes (Fig. 58):
> Graphic O2.
> O2 bar graph segments representing Oxygen accumulated
at the end of the dive.
> Value of Max PO2 achieved (ATA) and graphic PO2.
> GAS 1 FO2 Set Point for that dive and symbol FO2.
> Tank 1 icon representing GAS 1.
> Symbol NITROX.
 Pressing and releasing the S button momentarily (< 2
seconds) button will advance to the previous dive's LOG
PREVIEW screen.
 Depressing the M button for 2 seconds or if no button is
pressed during a 2 minute period operation will revert to
the NORM or GAUG SURF MAIN screen.
 Pressing the S button will activate the Backlight.
NOTE: FREE Dives are not recorded in the VT3's
LOG. The data is stored in Memory for subsequent Download to the Oceanlog PC Interface
program.
Fig. 58 - LOG DATA 2
71
NORM/GAUG HISTORY MODE
HISTORY Mode displays accumulative NORM and GAUG dive information.
Battery removal will not affect the HISTORY data stored for viewing.
10 minutes after a dive  pressing and releasing the A button 6 times momentarily (< 2 seconds each time)
while the NORM SURF MAIN screen is displayed will access HISTORY (NORM
SURF MAIN > ALT > PLAN > FLY > SAT > LOG > HISTORY), or  pressing and releasing the A button 4 times momentarily (< 2 seconds each) while the
GAUG SURF MAIN screen is displayed will access HISTORY (GAUG SURF MAIN >
ALT > FLY > LOG > HISTORY).
 Pressing and releasing the A button momentarily (< 2 seconds) will advance to the
NORM or GAUG SURF MAIN screen.
 Depressing the M button for 2 seconds or if no button is pressed during a 2 minute
period operation will revert to the NORM or GAUG SURF MAIN screen.
 Pressing the S button will activate the Backlight.
HISTORY 1 screen information includes (Fig. 59):
> Graphic HIST.
> Symbol DIVE and total number of All NORM and GAUG
dives recorded up to 9999.
> Symbol TIME and graphic Hr with the Total Hours of Elapsed
Dive Time up to 9,999.
 Pressing and releasing the S button momentarily (< 2
seconds) button will advance to the HISTORY 2 screen.
72
Fig. 59 - HISTORY 1
HISTORY 2 screen information includes (Fig. 60):
> Graphic SEA (or EL 2 through EL 7), highest Altitude at
which a NORM or GAUG dive was conducted.
> Temperature, lowest recorded of all NORM and GAUG
dives.
> Maximum Depth achieved during all NORM and GAUG
dives with symbols FT (or M) and MAX.
 Pressing and releasing the S button momentarily (< 2
seconds) button will advance to the NORM or GAUG SURF
MAIN screen.
 Depressing the M button for 2 seconds or if no button is
pressed during a 2 minute period operation will revert to
the NORM or GAUG SURF MAIN screen.
 Pressing the S button will activate the Backlight.
NOTE: FREE Dives are not recorded in the VT3's
HISTORY. The data is stored in Memory for
subsequent Download to the Oceanlog PC Interface program.
Fig. 60 - HISTORY 2
73
OVERVIEW OF DISPLAYED SYMBOLS AND ICONS
SYMBOLS
BAR (or) PSI
STOP TIME (or) DIVE TIME
AIR TIME (or) TIME NDC (or) TIME O2 (or) TIME TAT (or) TIME SURF
NITROX
FO2
FT (or) M
MAX
MEANING
Selected Tank's Pressure Units
Ceiling Stop Time or Elapsed Dive Time (hr:min if NORM or
GAUG; min:sec if FREE) or Dive #
Air Time Remaining (hr:min)
No Decompression Dive Time Remaining (hr:min)
O2 Dive Time Remaining (hr:min)
Ascent Time plus Deco Stop Times (hr:min)
Elapsed Surface Interval Time (hr:min if NORM or GAUG, or FREE
> 59:59; min:sec if FREE up to 59:59)
FO2 for any GAS is set at a numerical value (=>21%)
FO2 Set Point is being displayed
Depth Units (Feet or Meters)
Maximum (Depth or PO2)
VT3 Battery Low
ICONS
Ascend
Descend
Degrees
(F or C)
GAS in use
74
WARNING: Prior to diving with the VT3, you
must also read and understand the Oceanic
Dive Computer Safety and Reference Manual,
Doc. No. 12-2262, which provides Important
Warnings and Safety Recommendations as
well as general product information.
OVERVIEW OF DIVE MODE
INFORMATION
75
Poor
Reception
Distance
(greater than 6 feet/2 meters)
Poor
Reception
Area
Best
Reception
Area
Poor
Reception
Area
76
Poor
Reception
Area
Poor
Reception
Area
Transmitter Signal Reception Guide
POSITIONING OF THE VT3
The Transmitters (TMTs) emit low frequency signals that radiate
outward in semicircular patterns that are parallel to the length
dimension of the TMT. A coiled antenna inside the VT3 receives
the signals when it is positioned within a zone parallel to or at a
45 degree angle to the TMT as illustrated on page 76.
The VT3 cannot effectively receive a signal when it is held out to
the sides of the TMT or held at distances greater than 6 feet (2
meters) in front of the TMT. Best reception is achieved when the
VT3 is within 3 feet (1 meter) of the TMT.
When installed into the high pressure ports of the Regulator First
Stages, the TMTs must be positioned so that they face horizontally outward from the Tank Valves.
Link Interruption Underwater
During a dive, you may at times move the VT3 out of the signal
pattern of the TMT, resulting in a temporary interruption of the
Link signal.
An interruption lasting greater than 15 seconds will cause the
Tank Pressure value to flash, the Audible Alarm to sound, and
message TMTx > LINK > LOST to scroll (Fig. 61). The Link will
be restored within 4 seconds after the VT3 is moved back into its
correct position.
Fig. 61 - Link Interruption
Underwater
77
DTR = NDC
(No Deco)
An interruption of the TMT Link may also occur while the VT3 is
in an area within 3 to 4 feet (1 meter) of a running Dive Propulsion Vehicle. The Link will be restored within 4 seconds after the
Vehicle is shut off or the VT3 is moved out of that area. When
using a Strobe, a temporary interruption may occur shortly after
the Strobe flashes. The Link will be restored within 4 seconds.
DIVE TIME REMAINING (DTR)
a
DTR = OTR
DTR = ATR
Fig. 62 - Dive Time Remaining
78
One of the most important pieces of information on Oceanic
dive computers is the Dive Time Remaining numeric display. The
VT3 constantly monitors No Decompression status, Oxygen
Accumulation, and Breathing Gas Consumption Rate.
The Dive Time Remaining display (Fig. 62) will indicate the No
Deco, O2, or Air Time, whichever Time is the least amount
available. The specific Time being displayed is identified by the
symbols TIME and NDC (or O2 or AIR).
In the event that Air Time Remaining (ATR) becomes less than
NDC and O2 Time, after 1 minute the Audible Alarm will sound,
the LED will flash, and the Pressure value will flash.
ATR will also be displayed digitally when 60 minutes or less in
decrements of 10 minutes (Fig. 62a).
No Decompression Dive Time Remaining (NDC)
No Decompression Dive Time Remaining is the maximum
amount of time that you can stay at your present Depth before
entering a Decompression situation. It is calculated based on
the amount of Nitrogen absorbed by hypothetical tissue compartments. The rates each of these compartments absorb and
release Nitrogen is mathematically modeled and compared
against a maximum allowable Nitrogen level. Whichever one is
closest to this maximum level is the controlling compartment for
that Depth. Its resulting value will be displayed numerically
along with the symbols TIME and NDC (Fig. 63a) and graphically as the Tissue Loading Bar Graph (Fig. 63b).
As you ascend from Depth following a dive that has approached
the No Decompression Limit, the TLBG segments will recede as
control shifts to slower compartments. This is a feature of the
Decompression Model that is the basis for Multilevel Diving, one
of the most important advantages that Oceanic dive computers
offer.
The VT3's algorithm is based upon Haldane’s theory using
maximum allowable nitrogen levels developed by Merrill Spencer. Repetitive diving control is based upon experiments designed and conducted by Dr. Ray Rogers and Dr.®Michael
Powell in 1987. Diving Science
and Technology (DSAT), a
corporate affiliate of PADI®, commissioned these experiments.
b
a
Fig. 63 - DTR is NDC
79
Oxygen Accumulation Time Remaining (OTR)
When the VT3 is set for Nitrox operation, Oxygen Accumulation
(saturation or exposure) during a dive, or 24 hour period,
appears graphically as the O2 Bar Graph (O2BG) (Fig. 64a).
As time remaining before reaching the Oxygen Exposure Limit
decreases, segments are added to the O2BG.
When the amount of time remaining before reaching the Oxygen Limit becomes less than the No Decompression Dive Time
Remaining, calculations for that Depth will be controlled by
Oxygen. Oxygen Time Remaining (OTR) will then appear as the
Dive Time Remaining (DTR) display (Fig. 64b) as signified by the
symbols TIME and O2. As Oxygen Accumulation continues to
increase, segments will add to the O2BG.
Air Time Remaining (ATR)
b
a
Fig. 64 - O2 Time Remaining
80
The VT3 calculates Air Time Remaining (ATR) using a patented
algorithm that is based on a diver's individual Air Consumption
Rate and Current Depth.
> Tank Pressure is measured once each second and an
average rate of Consumption is calculated over a 90
second period.
> This Rate of Consumption is then used in conjunction with a
knowledge of the Depth dependence to predict the Air
required for the diver to make a safe controlled Ascent
including any required Decompression Stops.
Air Consumption and Depth are continuously monitored and Air
Time Remaining reflects any change in circumstances. For
example, when a buddy starts breathing from your Octopus or
you suddenly find yourself swimming against a strong current
and begin breathing more rapidly, the VT3 will recognize the
change and adjust the ATR accordingly.
ATR is the time you can remain at the present Depth and still
safely surface with the Tank Pressure Reserve that you selected
during setup (End Pressure Alarm Setting).
ATR, identified by the symbols AIR and TIME (Fig. 65a), can be
viewed when an Alternate Display is accessed during dive
modes. It is also displayed digitally on the MAIN screen. In the
event that ATR becomes less than No Deco and O2 Time, it will
be displayed on the Main Display as Dive Time Remaining until
it becomes greater than one or the other.
a
Fig. 65 - NORM DIVE ALT 2
Air Time Remaining (ATR) Alarm
When ATR decreases to 5 minutes (0:05), the Audible Alarm
will sound and the LED will flash.
If ATR decreases to 0:00, the Audible will sound and the LED
will flash again. The message LOW > AIR > TIME will scroll at
the top of the screen (Fig. 66) until ATR becomes greater than 5
minutes (0:05).
Fig. 66 - Low Air Time
81
You should immediately initiate a controlled Ascent while monitoring your Tank Pressure.
However, there is no reason to panic, the VT3 has allowed for the Air necessary for a safe
Ascent including the No Deco Safety Stop, if set On, and any Decompression Stops
required.
Example:
 You set the End Pressure Alarm for 300 PSI (20 BAR)
 You are at a Depth of 60 FT (20 M)
 Air Time Remaining decreases to 0:00
 You Ascend at a maximum rate of 30 FPM (10 MPM)
 You surface with 300 PSI (20 BAR) pressure still in your Tank
ASCENT RATE ALARM
Alarms associated with Ascent Rate are based upon 2 sets of
speeds which change at a reference depth of 60 FT (18 M).
WARNING: At depths greater than 60 FT (18 M),
Ascent Rates should not exceed 60 FPM (18 MPM).
At depths of 60 FT (18 M) and shallower, Rates
should not exceed 30 FPM (9 MPM).
Fig. 67 - Ascent Rate Alarm
82
The Audible will sound, the red LED will flash, and the message
SLOW > SLOW will scroll on/off at the top of the screen (Fig.
67). The Audible and LED will stop when acknowledged with
the A button or when the Ascent is slowed. The message will
continue to scroll until Ascent is slowed.
CONTROL OF DISPLAYS
During Dive Modes, there is a Main (Default) Display of important information relevant to
the specific mode that the VT3 is operating in (No Deco, Deco, GAUG, FREE, etc.).
Alternate (ALT) Displays can be accessed by pressing and releasing the A button to view
additional information. They will automatically revert to the Main Display after 5 seconds.
 MAIN > ALT 1 (Temp/Time) > ALT 2 (EDT/ATR) > ALT 3 (O2 Data, if set for Nitrox)
Alarms can be acknowledged/silenced by pressing the A button for 2 seconds.
The S button is used to activate the SmartGlo Backlight.
 The display will be illuminated as long as the button is depressed, plus the Backlight
Duration time that has been set (0, 5, or 10 seconds) for a maximum of 20 seconds
 The Backlight will not activate during a Low Battery condition.
When TMT 2-3 USE is set for SELF, the M button is used for viewing Gas Switch Preview
screens (FO2) and Switching Gas. When TMT2-3 USE is set for BUD, the M button is used
for viewing Tank Pressure of 1 or 2 buddies whose TMTs have been coded as the VT3's
BUD 1 (TMT 2) and BUD 2 (TMT 3) settings.
_____________________________________________________________________________
 Left/Front - Mode/Mix (M) button
 Right/Front - Advance (A) button
S
 Right/Side - Select (S) button
M
A
83
WET CONTACTS
Alternates with
(NORM and ELx)
Fig. 68 - NORM SURF MAIN
(unit Wet)
84
The Wet Contact Dive Mode Activation feature is active any time
WET ACTIVATION is set ON.
The VT3 is configured with contacts that will automatically
activate Dive Mode when the space between the contacts is
bridged by a conductive material (immersed in water) and it
senses a Depth of 5 FT (1.5 M) for 5 seconds.
The contacts are the pins of the PC Interface Data Port and the
stems of the Push Buttons.
As long as the contacts are bridged on the Surface, the graphic
WET will alternate with the graphics NORM and SEA (or EL2 to
EL7) on the NORM SURF MAIN screen (Fig. 68). Also on the
GAUG and FREE SURF MAINs.
Upon removing the bridge between the contacts (drying the
VT3), the graphic WET will no longer be displayed.
The VT3 will continue checking for Depth, until a dive is made or
it shuts Off after 2 hours after activation.
WARNING: Prior to diving with the VT3, you
must also read and understand the Oceanic
Dive Computer Safety and Reference Manual,
Doc. No. 12-2262, which provides Important
Warnings and Safety Recommendations as
well as general product information.
NORM TYPE DIVE MODES
85
NORM NO DECOMPRESSION DIVE MODE
When the Wet Activation feature is set ON, the VT3 will enter the Dive Mode any time you
descend to 5 FT (1.5 M).
When the Wet Activation feature is set OFF, the VT3 will not enter Dive Mode upon
descent unless it is first Activated by push button and operating in one of the Dive Computer modes (menus) at that time, a mode such as Surface, Fly, Log, etc.
At any time during the dive  Press the S button to activate the SmartGlo Backlight.
 Depress the A button for 2 seconds to acknowledge and
silence Alarms.
ABBREVIATIONS USED
TLBG = TISSUE LOADING
BAR GRAPH
O2BG = OXYGEN ACCUMULATION BAR GRAPH
VARI = VARIABLE ASCENT
RATE INDICATOR
DTR = DIVE TIME REMAINING
ATR = AIR TIME REMAINING
Fig. 69 - NORM DIVE NO
DECO MAIN
86
NORM DIVE NO DECO MAIN Display (Default),
information provided includes (Fig. 69) > TLBG representing Nitrogen Loading
> VARI while ascending
> O2BG, if any during Nitrox dives
> Tank Pressure with the PSI (or BAR) icon, if a TMT is active
and linked, flashing after 1 minute of Lost Link
> EDT (hr:min) with symbols DIVE and TIME
> DTR (hr:min) with symbols TIME and NDC (or O2 or AIR)
> ATR (decrements of 10 min), if =< 60 min
> Tank icon representing the GAS selected (1, 2, or 3)
> Symbol NITROX, if FO2 set for Nitrox
> Current Depth with symbol FT (or M)
 While the NORM DIVE MAIN screen is displayed, press/
release the A button (< 2 sec) to view NORM DIVE ALT 1.
 While the NORM DIVE ALT 1 screen is displayed, press/
release the A button (< 2 sec) to view NORM DIVE ALT 2.
 While the NORM DIVE ALT 2 screen is displayed, press/
release the A button (< 2 sec) to view NORM DIVE ALT 3.
HINT:
ALT 1 is always Temperature, Time
ALT 2 displays EDT, Max Depth, TMT #, and ATR
ALT 3 displays selected GAS #, PO2, and FO2
 While the NORM DIVE MAIN screen is displayed, press the
M button for 2 seconds to access the TMT 2-3 USE screen
to enter the Gas Switch menu or Buddy Pressure Check.
WARNING: The
Wet Activation
feature will not
function unless it is
Set ON (a user
setting) and the
contacts are
bridged without
interference.
NORM DIVE NO DECO ALT 1 Display,
information provided includes (Fig. 70) > Day of the Week graphic (MON, TUE, etc.)
> Temperature with degrees icon and graphic F (or C)
> Time of Day (hr:min).
 Press/release the A button (< 2 sec) to view ALT 2.
 The display will revert to the MAIN Display after 5 seconds
unless A is pressed to access the ALT 2 display.
Fig. 70 - NORM DIVE NO
DECO ALT 1
87
During the time that
an Alarm is sounding,
Alternate and Gas
Switch Preview
displays cannot be
accessed.
NORM DIVE NO DECO ALT 2 Display,
information provided includes (Fig. 71) > TLBG representing Nitrogen Loading
> VARI while ascending
> O2BG, if any during Nitrox dives
> Graphic TMT1 (or 2 or 3), and
> Tank Pressure with the PSI (or BAR) icon, if a TMT is active
and linked, flashing after 1 minute of Lost Link
> EDT (hr:min) with symbols DIVE and TIME
> ATR (hr:min) with symbols AIR and TIME
> ATR (decrements of 10 min), if =< 60 min
> Tank icon representing the GAS selected (1, 2, or 3)
> Symbol NITROX (if set for Nitrox)
> Max Depth with icons FT (or M) and MAX
 Press/release the A button (< 2 sec) to view ALT 3.
 The display will revert to the MAIN Display after 5 seconds
unless A is pressed to access the ALT 3 display.
NOTE: Access to the TMT 2-3 USE screen to enter
the Gas Switch menu or Buddy Pressure Check
can only be accomplished while viewing the
MAIN display.
88
Fig. 71 - NORM DIVE
NO DECO ALT 2
NORM DIVE NO DECO ALT 3 Display (if set for Nitrox),
Information includes (Fig. 72) > TLBG representing Nitrogen Loading
> VARI while ascending
> O2BG
> Graphic GAS1 (or 2 or 3) representing the GAS selected
> Level of PO2 (ATA) with graphic PO2
> FO2 Setting and symbol FO2
> Tank icon representing the GAS selected (1, 2, or 3)
> Symbol NITROX
> Current Depth and symbol FT (or M)
 The display will revert to the MAIN Display after 5 seconds.
NOTE: The Alternate Displays cannot be accessed during the time when an Alarm is sounding.
NORM DIVE NO DECO SAFETY STOP
Upon ascending to 5 FT (1.5 M) below the Safety Stop Depth set
on any NORM No Decompression dive in which Depth exceeded 30 FT (9 M), a short beep will be emitted and a Safety
Stop at the Depth set will appear on the display with a countdown timer that begins at the Safety Stop Time set and counts
down to 0:00 (min:sec).
Fig. 72 - NORM DIVE
NO DECO ALT 3
89
The Safety Stop will be displayed until the countdown times out,
or you descend below 30 FT (10 M), or you surface. There is
no Penalty if you surface prior to completing the Safety Stop.
If the Safety Stop was set to OFF, the screen will not appear
during the ascent.
NORM DIVE NO DECO SAFETY STOP MAIN Display,
Information includes (Fig. 73) > Graphics SAFE, STOP, and xxF or xxM (value of the Stop
Depth set) scrolling at the top
> TLBG representing Nitrogen Loading
> VARI if ascending
> O2BG, if any during Nitrox dives
> Tank Pressure with the PSI (or BAR) icon, if a TMT is active
and linked
> Symbols STOP and TIME and the Stop Time (min:sec) set
> DTR (hr:min) with symbols TIME and NDC (or O2 or AIR)
> ATR (decrements of 10 min), if =< 60 min
> Tank icon representing the GAS selected (1, 2, or 3)
> Symbol NITROX (if set for Nitrox)
> Current Depth with symbol FT (or M)
 Press/release the A button to view the NORM MAIN and
ALT Displays previously described.
90
STOP DEPTH
F = FT
M = METERS
Fig. 73 - NORM DIVE NO
DECO SAFETY STOP MAIN
DECOMPRESSION DIVE MODE
The VT3 is designed to help you by providing a representation
of how close you are to entering Decompression.
Decompression Dive Mode activates when theoretical No
Decompression time and depth limits are exceeded.
Upon Entry into Decompression Mode, the Audible Alarm will
sound, the red LED Warning Light will flash, and the graphic
message DECO > STOP will scroll each 3/4 second On and 1/
4 second Off (Fig. 74), until acknowledged or for 10 seconds
(unless set OFF).
 Depress the A button for 2 seconds to acknowledge/silence
the Audible Alarm.
> The UP Arrow will flash if you are greater than 10 FT (3 M)
deeper than the Required Stop Depth.
> Once you are within 10 FT (3 M) of, and below, the
Required Stop Depth, the UP Arrow will be removed.
> Once silenced, the graphics DECO > STOP > xxF or xxM
will scroll each 2 seconds On 2 seconds blank.
At any time during the dive  Depress the S button to activate the Backlight.
 Press/release the A button to access Alternate displays.
Fig. 74 - DECO ENTRY
91
To fulfill your decompression obligation, you should make a safe controlled Ascent to a
depth slightly deeper than (Fig. 75a), or equal to, the Required Ceiling Stop Depth indicated (Fig. 75b) and decompress for the Stop Time indicated (Fig. 75c).
The amount of decompression Credit Time that you receive is dependent on Depth, with
slightly less Credit given the deeper you are below the Stop Depth indicated.
You should stay slightly deeper than the Required Stop Depth indicated until the next
shallower Stop Depth appears. Then, you can slowly ascend to, but not shallower than
that indicated Ceiling Stop Depth.
DECO STOP MAIN Display (Default), information provided includes (Fig. 75) > Graphics DECO, STOP, and xxF or xxM (the Stop Depth)
scrolling at the top
> TLBG representing Nitrogen Loading
> O2BG, if any during Nitrox dives
> Tank Pressure with the PSI (or BAR) icon, if a TMT is active
b
and linked
c
> Symbols STOP and TIME and Stop Time (hr:min) required
a > Symbols TIME and TAT and Total Ascent Time (hr:min)
required
> ATR (decrements of 10 min), if =< 60 min
> Tank icon representing the GAS selected (1, 2, or 3)
> Symbol NITROX (if set for Nitrox)
> Current Depth with symbol FT (or M)
Fig. 75 - DECO STOP MAIN
92
 Press/release the A button (< 2 sec) to view DECO STOP
ALT 1, then ALT 2 and ALT 3.
DECO MAIN > ALT 1 > ALT 2 > ALT 3
 Depress the M button for 2 seconds to access the Gas
Switch or Buddy Pressure Check menu.
Total Ascent Time (TAT)
Total Ascent Time includes Stop Times required at all required
decompression ceilings (Stops) and vertical Ascent Time to the
surface calculated at 60 FPM (18 MPM) for depths deeper than
60 FT (18 M), and 30 FPM (9 MPM) for depths of 60 FT (18 M)
and shallower.
DECO STOP ALT 1 Display, information provided includes
Fig. 76) > Day of the Week graphic (MON, TUE, etc.)
> Temperature with degrees icon and graphic F (or C)
> Time of Day (hr:min).
 Press/release the A button (< 2 sec) to view DECO STOP
ALT 2.
 The display will revert to the DECO STOP MAIN Display
after 5 seconds unless A is pressed.
Fig. 76 - DECO STOP ALT 1
93
DECO STOP ALT 2 Display, information includes (Fig. 77) -
Fig. 77 - DECO STOP ALT 2
Fig. 78 - DECO STOP ALT 3
94
> Graphic TMT1 (or 2 or 3) and Tank Pressure with the PSI
(or BAR) icon, if a TMT is active and linked
> TLBG, all segments
> O2BG, if any during Nitrox dives
> EDT (hr:min) with symbols DIVE and TIME
> ATR (hr:min) with symbols AIR and TIME
> Tank icon representing the GAS selected (1, 2, or 3)
> Symbol NITROX (if set for Nitrox)
> Max Depth with icons FT (or M) and MAX
 Press/release the A button to view DECO STOP ALT 3.
 The display will revert to the DECO STOP MAIN Display
after 5 seconds unless the A button is pressed.
DECO STOP ALT 3 Display, information includes (Fig. 78) > Graphic GAS1 (or GAS2 or GAS3)
> TLBG, all segments
> O2BG, if any during Nitrox dives
> Level of PO2 (ATA) with graphic PO2
> FO2 Setting and symbol FO2
> Tank icon representing the GAS selected (1, 2, or 3)
> Symbol NITROX
> Current Depth and symbol FT (or M)
 The display will revert to the DECO MAIN after 5 seconds.
VIOLATION MODES
While in Violation Modes, the Alternate Displays previously described can be accessed
using the A button, the Backlight can be activated using the S button, and Alarms can be
acknowledged and silenced with the A button.
 Alternate Displays will be similar to the DECO screens and not repeated. They revert
to the MAIN (Default) Display after 5 seconds unless A is pressed.
NORM CONDITIONAL VIOLATION
If you ascend shallower (Fig. 79a) than a Required Decompression Ceiling Stop Depth
(Fig. 79b), the Audible Alarm will sound, and the red LED, Down Arrow, and Full TLBG will
flash until you descend below the Required Stop Depth. The graphic message DOWN >
DOWN will scroll at the top of the display until the Alarm is acknowledged/silenced, then
the message DOWN > TO > xxF or xxM will scroll.
If you descend below the required Decompression Ceiling before
5 minutes have elapsed, the VT3 will continue to function in
Decompression Dive Mode. In this case, no off gassing1 Credit
b
will be given, and for each minute above the Ceiling 1 /2
minutes of Penalty Time will be added to Required Stop Time.
> The added Penalty (decompression) Time will have to be
'worked off' first, before obtaining off gassing Credit.
> Once the Penalty Time is worked off, and off gassing Credit
begins, required Deco Stop Depths and Time will decrease
toward zero. The TLBG will recede into the No Deco Zone
a
and the VT3 will revert to the No Deco Dive Mode.
Fig. 79 - NORM CONDITIONAL VIOLATION MAIN
95
NOTE: Upon entry into the following 3 Delayed
Violation Modes, the red LED flash and the Audible Alarm will sound, even if Set OFF. When
these events occur, the Alarm cannot be acknowledged (silenced) by pressing the A button.
Fig. 80 - NORM DELAYED
VIOLATION #1 MAIN
Fig. 81 - NORM DELAYED
VIOLATION #2 MAIN
96
NORM DELAYED VIOLATION #1 (Fig. 80)
If you remain above the Required Ceiling Stop Depth for more
than 5 minutes, the full TLBG and DOWN Arrow will flash until
you descend below the Required Stop Depth. The graphic
message DOWN > TO > xxF (or xxM) will continue to scroll.
> This is a continuation of a Conditional Violation.
NORM DELAYED VIOLATION #2 (Fig. 81)
The VT3 cannot calculate Decompression times for Stop Depths
much greater than 60 FT (18 M) and offers no indication of how
much time spent underwater would result in the need for a
greater Stop Depth.
If the Decompression obligation requires a Ceiling Stop Depth
between 60 FT (18 M) and 70 FT (21 M), the TLBG will flash
and the graphic message DECO > STOP > 60F (18M) will scroll
at the top of the display.
When Delayed Violation #2 occurs, you must make a controlled
Ascent to just deeper than, and stay as close as possible to, 60
FT (18 M) without causing the TLBG to flash. When the Required Stop Depth indicates 50 FT/15 M, etc., you can ascend
to those Stop Depths and continue decompressing.
NORM/GAUG DELAYED VIOLATION #3 (Fig. 82)
If you descend deeper than the Maximum Operating Depth of
330 FT (100 M), or 399 FT (120 M) when operating in GAUG
Mode, the UP Arrow will flash, and the Current Depth and Max
Depth (on ALT 2) displays will only indicate 3 dashes ( - - - )
signifying that you are Out of Range.
The graphic message TOO > DEEP will scroll at the top of the
display until Ascent is made above 330 FT (100 M), or 399 FT
(120 M) when operating in GAUG Mode.
Upon ascending above those Depths, the Current Depth display
will be restored, however Max Depth (on ALT 2) will only display
3 dashes for the remainder of that dive. Also, the Log for that
dive will display 3 dashes as the Max Depth achieved.
Fig. 82 - DELAYED VIOLATION #3 MAIN
97
IMMEDIATE VIOLATION AND VIOLA GAUGE MODE
If a Decompression Ceiling Stop Depth much greater than 60 FT
(18 M) is required, an Immediate Violation Mode will be entered. This situation would be preceded by entering Delayed
Violation Mode #2.
The VT3 would then operate in Violation Gauge Mode during
the remainder of that dive and for 24 hours after surfacing.
Violation Gauge Mode turns the VT3 into a digital instrument
without any decompression or oxygen monitoring functions.
VIOLATION GAUGE DIVE MAIN DISPLAY (Default),
information provided includes (Fig. 83) > Message UP > VIOL, scrolling
> Full TLBG and O2BG, both flashing signifying Violation
> VARI if ascending
> Tank Pressure with the PSI (or BAR) icon, if a TMT is active
and linked
> EDT (hr:min) with symbols DIVE and TIME
> Symbols TIME and NDC with 0:00 (hr:min) Time Remaining
> ATR (decrements of 10 min), if =< 60 min
> Tank icon representing the GAS selected (1, 2, or 3)
> Symbol NITROX (if set for Nitrox)
> Current Depth with symbol FT (or M)
Fig. 83 - VIOLATION GAUGE
DIVE MAIN
98
The VT3 will also enter an Immediate Violation Mode (Violation
Gauge Mode) 5 minutes after surfacing from a dive in which a
Delayed Violation occurred.
Violation Gauge Mode on the Surface does not allow
access to the SET F, PLAN, FLY, and SAT features/screens.
The countdown timer that appears when you try to access Time
to Fly does not represent Time to Fly. It is only provided to
inform you of the time remaining before normal operation can
resume with full VT3 features and functions.
This condition is a Permanent Violation, and in the event that a
dive is made during the 24 hour period, a full 24 hour surface
interval must then be served before all functions are restored.
VIOLATION GAUGE SURF MAIN Display (Default),
information provided includes (Fig. 84) > Full TLBG and O2BG, both flashing signifying Violation
> Message VIOL alternating with SEA (and WET if wet)
> Tank Pressure with the PSI (or BAR) icon, if a TMT is active
and linked
> Symbol DIVE and number of that dive
> Symbols TIME and SURF with Surface Interval Time (hr:min)
> Tank icon representing GAS1 (surface default)
> Symbol NITROX (if set for Nitrox)
Fig. 84 - VIOLATION
GAUGE SURF MAIN
99
WARNING:
If a High PO2
condition occurs
while in Deco
Mode, the
message HIGH >
PO2 will replace
the DECO
message until
PO2 < 1.60.
Fig. 85 - HIGH PO2 MAIN
100
NORM HIGH PO2
When partial pressure of oxygen (PO2) becomes equal to, or
greater than, 0.20 ATA less than the PO2 Alarm Set Point (a SET
A Group setting); the red LED warning light will flash, the Audible Alarm will sound, and the message HIGH > PO2 will scroll
until the Alarm is acknowledged/silenced.
 The graphic PO2 and UP Arrow will appear solid on the
MAIN Display (Fig. 85) as a warning until PO2 decreases.
 After the Alarm is silenced, the graphic message UP >
HIGH > PO2 will scroll.
If PO2 continues to increase, the value displayed will increase in
increments of 0.01 ATA to a maximum value of 5.00 ATA.
When PO2 reaches the PO2 Alarm Set Point, the red LED
warning light will flash and the Audible Alarm will sound again.
> The graphic PO2 and UP Arrow will flash as a warning
until PO2 decreases below the Alarm Set Point.
> The message UP > HIGH > PO2 will continue to scroll.
> The value of PO2 can be viewed by accessing the ALT 2
Display by pressing/releasing the A button 2 times.
> The unit will revert to the MAIN Display after 5 seconds.
HIGH OXYGEN ACCUMULATION
The O2 Bar Graph (O2BG) displays either oxygen accumulated
during that nitrox dive, or during the repetitive nitrox dives you
conduct during that 24 hour period, whichever of the two is
greater at that time. The O2BG allows you to monitor how close
you are coming to the limits of oxygen exposure.
If the theoretical amount of oxygen accumulated equals, or
exceeds, the limit for a single exposure, or the exposure limit for
a 24 hour period (300 OTU), Oxygen Dive Time Remaining
becomes 0:00 (hr:min), the graphic O2 appears and the full O2
Bar Graph and UP Arrow will be displayed flashing (Fig. 86).
The red LED warning will flash, the Audible Alarm will sound,
and the message HIGH > O2 will scroll at the top of the display.
When the Alarm is acknowledged/silenced, the message UP >
HIGH > O2 will scroll until the level of oxygen decreases below
the limit.
 Press/release the A button to view the Alternate displays.
> The unit will revert to the MAIN Display after 5 seconds.
Upon surfacing during a High O2 Alarm condition, operation
will lock into NORM Mode, blocking access to GAUG and
FREE, until the O2BG recedes to 4 segments.
A chart listing the
NOAA O2 limits
is provided on
page 151.
Fig. 86 - HIGH O2 MAIN
101
SUMMARY OF NORM/GAUG WARNING AND ALARM MESSAGES
MESSAGE
DECO > STOP > xxF (M)
DOWN > TO > xxF (M)
DECO > STOP > 60F (18M)
HIGH > PO2
UP > HIGH > PO2
UP > HIGH > O2
TOO > DEEP
UP > VIOL
SLOW > SLOW
LOW > AIR > TIME
LOW > DIVE > TIME
TURN > GAS > ALRM
END > GAS > ALRM
TIME > TOO > LONG
UP > HIGH > NI
TMT1 > LINK > LOST
TMT1 > NotAvAil
DONT > SWCH
102
MEANING
Entry into Decompression Mode.
Above Required Decompression Stop Depth.
Deco Stop greater than 60 FT (18 M) required.
High PO2 while in Deco Mode.
Exceeded PO2 alarm Set Point.
High O2 alarm.
Depth alarm.
Deco Stop greater than 70 FT (21 M) required.
Ascent Rate Too Fast alarm.
Air Time Remaining alarm (less than 5 minutes).
Dive Time Remaining alarm (NDC, O2, or ATR).
TMT1 Turn Pressure alarm.
TMT End Pressure alarm (TMT in use).
Elapsed Dive Time alarm.
TLBG alarm.
Active TMT Transmission Link Lost (also TMT2 and TMT3).
TMT not active (also TMT2 and TMT3).
Don't Switch to the new Gas (exposure to excess PO2).
WARNING: Prior to diving with the VT3, you
must also read and understand the Oceanic
Dive Computer Safety and Reference Manual,
Doc. No. 12-2262, which provides Important
Warnings and Safety Recommendations as
well as general product information.
SWITCHING GAS MIXES
AND
BUDDY PRESSURE CHECK
103
SWITCHING GAS MIXES (NORM only)
During NORM Dives, the VT3 can be manually switched from GAS 1 to GAS 2 to GAS 3,
changing FO2 displays and calculations from the FO2 value set for GAS 1 to the FO2
value set for GAS 2 to the FO2 value set for GAS 3, and if TMTs are used, changing
Pressure related displays and calculations from TMT 1 (Transmitter 1) to TMT 2 to TMT 3.
NOTE: Switching the VT3 from one GAS to another cannot be performed while on the surface, during dives when TMT 2-3 USE is set for
Buddy Pressure Check, or when operating in GAUG Mode.
Every dive begins with GAS 1. 10 minutes after surfacing from a
multiple gas dive, the VT3's operation defaults to the GAS 1 FO2.
Access to NORM DIVE Gas Switching screens can only be accomplished during the time
that a NORM DIVE MAIN screen is being displayed and cannot be performed during the
time that an Alarm is sounding.
NOTE: If a Switch to a new Gas Mix would expose the diver to a prohibitive PO2 level of 1.60
ATA or greater, the Audible Alarm will sound, the
red LED will flash, and the message DONT >
SWCH will scroll at the top of the display (Fig. 87)
until acknowledged by depressing the A button
for 2 seconds.
Fig. 87 - DON'T SWITCH
GAS ALARM
104
Due to the possibility that sufficient air may not be available in
the Switch From tank to complete the dive, the Switch to the
prohibitive Mix can still be made. If the Switch is made to the
prohibitive Mix while in NORM NO DECO DIVE Mode, the
High PO2 Alarm will activate. If the Switch is made to the
prohibitive Mix while in DECO DIVE Mode, the message HIGH
> PO2 will replace the scrolling DECO message until the High
PO2 condition clears.
Switching of Gas Mixes can only to be performed during the
time that a Gas Switch Preview screen is being displayed. These
are accessed from the TMT 2-3 USE screen.
 Depressing the M button for 2 seconds while viewing a
NORM DIVE MAIN screen will access the TMT 2-3 USE
(Lead-in) screen displaying the Set Point SELF (Fig. 88). If
'bud' is displayed, indicating that the VT3 is set for Buddy
Pressure Check, a Gas Switch cannot be made.
 Pressing and releasing the M button momentarily (< 2
seconds) while the TMT 2-3 USE screen is displayed (with
the setting SELF) will access the GAS 1 Switch Preview
screen.
 The VT3 will revert to the NORM DIVE MAIN screen after
10 seconds of no further M button action.
When a switch is
made to another
GAS, there may be
a delay of 5 to 15
seconds before the
VT3's Receiver picks
up the TMT's signal.
Fig. 88 - GAS SWITCH
LEAD-IN
105
GAS 1 SWITCH PREVIEW, information includes (Fig. 89) -
Fig. 89 - GAS 1 SWITCH
PREVIEW
Fig. 90 - GAS 2 SWITCH
PREVIEW
106
> Graphic GAS1
> TLBG, representing Nitrogen Loading
> VARI, if ascending
> O2BG, if any
> FO2 Set Point for GAS 1 and the symbol FO2
> Tank icon, representing GAS 1
> Symbol NITROX
> Current Depth and symbol FT (or M)
 Press/release the M button momentarily (< 2 seconds) to
access the GAS 2 Switch Preview Display for 10 seconds.
GAS 2 SWITCH PREVIEW, information includes (Fig. 90) > Graphic GAS2
> TLBG, representing Nitrogen Loading
> VARI, if ascending
> O2BG, if any
> FO2 Set Point for GAS 2 and the symbol FO2
> Tank icon representing GAS 2
> Symbol NITROX
> Current Depth and symbol FT (or M)
 Press/release the M button momentarily (< 2 seconds) to
access the GAS 3 Switch Preview Display for 10 seconds.
TO SWITCH FO2 FROM GAS 1 TO GAS 2
 Depressing the M button for 2 seconds while viewing the
GAS 2 Switch Preview Display will Switch the VT3's FO2
from GAS 1 to GAS 2 and the VT3's Receiver from TMT 1
to TMT 2 (if active).
 After the switch is made, the NORM DIVE MAIN Display
will represent GAS 2 (Fig. 91). If TMT 2 is active, Air Time
Remaining is then calculated based on Tank 2's Pressure.
When Switching to a
GAS (FO2) associated
with a Tank that does
not have an active
TMT, the procedures
and displays will be
the same without
displaying Tank
Pressure.
TO SWITCH FO2 FROM GAS 2 BACK TO GAS 1
A Switch Back to FO2 GAS 1 can be performed, as follows:
 Press/release the M button momentarily (< 2 seconds) to
step through the Gas Switch Preview screens and access
the GAS 1 Switch Preview screen.
 Depress the M button for 2 seconds while the GAS 1 Switch
Preview screen is displayed to switch the VT3 from GAS 2
back to GAS 1 and the VT3's Receiver from TMT 2 back to
TMT 1 (if active).
 After the switch is made, the NORM DIVE MAIN Display
will represent GAS 1. If TMT 1 is active, Air Time
Remaining is then calculated based on Tank 1's Pressure.
Fig. 91 - NORM DIVE MAIN
(after a Switch to GAS 2)
107
GAS 3 SWITCH PREVIEW, information includes (Fig. 92) -
> Graphic GAS3
> TLBG, representing Nitrogen Loading
> VARI, if ascending
> O2BG, if any
> FO2 Set Point for GAS 3 and the symbol FO2
> Tank icon representing GAS 3
> Symbol NITROX
> Current Depth and symbol FT (or M)
 Press/release the M button momentarily (< 2 seconds) to
access the GAS 1 Switch Preview Display.
TO SWITCH FO2 FROM GAS 2 TO GAS 3
Fig. 92 - GAS 3 SWITCH
PREVIEW
108
 Depressing the M button for 2 seconds while viewing the
GAS 3 Switch Preview Display will Switch the VT3's FO2
from GAS 2 to GAS 3 and the VT3's Receiver from TMT 2
to TMT 3 (if active).
 When the switch is made, the NORM MAIN DIVE Display
will represent GAS 3. If TMT 3 is active, Air Time
Remaining is then calculated based on Tank 3's Pressure.
 A Switch Back to FO2 GAS 2 can be performed, as
previously described for switching GAS 2 Back to GAS 1.
BUDDY PRESSURE CHECK (NORM only)
During NORM Dives, the VT3 can be used to check (display)
Tank Pressure of 1 or 2 buddies whose TMT Link Codes (Serial
Numbers) have been entered as TMT 2 and TMT 3 in the VT3's
SET U menu.
NOTE: Use of the Buddy Pressure Check feature
cannot be performed when TMT 2-3 USE is set
for SELF (Gas Switching) or while operating in
GAUG Mode.
Access to Buddy Pressure Check screens during dives can only
be accomplished during the time that a NORM DIVE MAIN
screen is being displayed and cannot be performed while
viewing Alternate displays or during the time that an Alarm is
sounding.
BUDDY PRESSURE CHECK DURING DIVES
 Bring the VT3 within 3 feet (1 meter) of the Buddy's
Transmitter.
 Press and hold the M button for 2 seconds while viewing a
NORM DIVE MAIN screen to access the TMT 2-3 USE
screen displaying the Set Point bud (Fig. 93). If SELF is
displayed, indicating that the VT3 is set for FO2 GAS
Switching, a Buddy Pressure Check cannot be performed.
Fig. 93 - BUDDY PRESSURE
CHECK LEAD-IN
109
 Pressing and releasing the M button momentarily (< 2
seconds) while the TMT 2-3 USE (Lead-in) screen is
displayed (with the setting BUD) will start a Search for BUD
1 (TMT 2)) displaying the graphics BUD and SEArCH (Fig.
94) for a maximum of 5 seconds.
Fig. 94 - BUDDY SEARCH
NOTE: No further button action is required. The
displays will change automatically, then revert
to the NORM DIVE MAIN Display
 After 5 seconds, or less if BUD 1's (TMT 2's) signal is
acquired, the BUD 1 screen will appear displaying the
graphic BUD1 and BUD 1's Pressure (Fig. 95), or the
graphic NotAvAil (Not Available), for 5 seconds.
 After BUD 1's screen has been displayed for 5 seconds, the
BUD 2 screen will appear displaying the graphic BUD2
and BUD 2's Pressure, or the graphic NotAvAil for 5
seconds.
 After BUD 2's screen has been displayed for 5 seconds, the
screen will revert to the NORM DIVE MAIN Display.
Fig. 95 - BUDDY 1 (TMT 2)
PRESSURE CHECK
110
NOTE: The graphic NotAvAil (Not Available)
(Fig. 96) indicates that the Buddy is out of range
or the VT3's TMT 2 (or 3) setting does not match
the Serial Number of that Buddy's TMT.
BUDDY PRESSURE CHECK ON SURFACE
A Buddy Pressure Check can be accomplished when on the
Surface by accessing the TMT Status Check screens while the
NORM SURF MAIN screen is being displayed.
 Depressing and holding the S button for 2 seconds will
activate the VT3's Receiver and access the TMT Status
screens and Pressures of the Tanks reporting.
 TMT 2 and TMT 3 Battery Status is not displayed when TMT
2-3 USE is set for BUD (Buddy Check).
 If a TMT is not active and linked to the VT3, the message
NotAvAil (Not Available) will appear.
 Each screen will be displayed for 3 seconds.
 The display will then revert to the NORM SURF MAIN
screen.
Fig. 96 - BUDDY 2 (TMT 3)
PRESSURE CHECK
111
NORM DIVE
MAIN
TMT 2-3 USE
Set for SELF
M
2 sec
<< or >>
M
< 2 sec
Switches from
Gas 3/TMT 3 to
Gas 1/TMT 1
(after 3 sec)
GAS 1
PREVIEW
M
2 sec
M
< 2 sec
Switches from
Gas 1/TMT 1 to
Gas 2/TMT 2
(after 3 sec)
M
2 sec
GAS 2
PREVIEW
M
< 2 sec
Switches from
Gas 2/TMT 2 to
Gas 3/TMT 3
(after 3 sec)
112
M
2 sec
GAS 3
PREVIEW
M
< 2 sec
TMT 2-3 USE
Set for BUD
M
< 2 sec
GAS
SWITCHING
or
BUDDY
PRESSURE
CHECK
BUD
SEARCH
2 to 5
sec
BUD1
PRESSURE
5 sec
BUD2
PRESSURE
5 sec
Back to NORM DIVE MAIN
WARNING: Prior to diving with the VT3, you
must also read and understand the Oceanic
Dive Computer Safety and Reference Manual,
Doc. No. 12-2262, which provides Important
Warnings and Safety Recommendations as
well as general product information.
NORM POST DIVE MODES
113
POST DIVE SURFACE MODE
When you ascend to 2 FT (0.6 M), the VT3 will enter Surface Mode and begin counting
your Surface Interval.
TRANSITION PERIOD
If you descend during the first 10 minutes after surfacing (referred to as the Transition
Period), time underwater will be considered a continuation of that dive. The time at the
surface (if less than 10 minutes) will not be added as Dive Time.
Transition Period information on the surface includes (Fig. 97):
> Graphic NORM alternating with the Altitude Level graphic
SEA (or EL2 through EL7) and WET (if the unit is wet).
> Battery icon if a VT3 Low Battery Warning Condition exists,
flashing if Too Low.
> TLBG, representing Nitrogen loading.
> O2BG, if a Nitrox dive
> Tank Pressure with symbol PSI (or BAR), if the Receiver is
Linked with an active TMT.
> Symbol DIVE and Number of that dive.
> Symbols TIME and SURF, and Surface Interval Time (hr:min).
> NITROX symbol, if any GAS is set for a Nitrox dive.
> Tank icon representing the GAS in use.
During the Transition Period, the SURF ALT and LOG for that
dive can be accessed. Other modes (e.g., Plan, Fly, Sat, Hist,
Set) will be accessible after 10 minutes on the surface.
Fig. 97 - TRANSITION
PERIOD
114
SURF ALT Display during the Transition Period (Fig. 98)  To access SURF ALT, press and release the A button (< 2
seconds) while viewing the NORM SURF MAIN display.
 Press the S button to activate the SmartGlo Backlight.
 Press and release the A button (< 2 seconds) while viewing
the NORM SURF ALT display to access the LOG Preview
screen for that dive.
 The screen will revert to NORM SURF MAIN after 5
seconds unless the A button is pressed.
To view that dive's LOG during the Transition Period  Press and release the A button 2 times (< 2 seconds each)
while viewing the NORM SURF MAIN display to access the
LOG Preview screen (Fig. 99).
 Press the S button to view the LOG 1 screen (Nitrogen/
Dive data).
 Press the S button again to view the LOG 2 screen (Oxygen
data), if a Nitrox dive.
 Press the S button again to return to the NORM SURF MAIN
screen.
 The screen will revert to NORM SURF MAIN after 2 minutes
if no button is pressed.
Data for that dive will not be stored in the VT3's memory until
the 10 minute Transition Period on the surface is completed.
Fig. 98 - NORM SURF ALT
Fig. 99 - LOG PREVIEW
(during Transition Period)
115
Once 10 minutes have elapsed, the Surface Interval time display colon will stop flashing
indicating that the Dive and Transition Period are completed, and a subsequent descent
will be considered a new dive.
AFTER THE TRANSITION PERIOD
Once the Transition Period has ended, you will then have full access to other Modes (e.g.,
GAUG SURF, FREE SURF, PLAN, FLY, SAT, LOG, HISTORY, SET, etc.).
 To activate the SmartGlo Backlight, press the S button.
 To access SURF ALT, PLAN, FLY, etc., press/release the A button as required.
NORM SURF MAIN > GAUG SURF MAIN > FREE SURF MAIN
NORM SURF MAIN > ALT > PLAN > FLY > SAT > LOG > HIST
> The Planning Sequence now displays adjusted No Decompression Limits based on
residual nitrogen and accumulated oxygen calculated to be remaining from the
previous dives.
> The Time to Desaturate counter provides calculated time for tissue desaturation at sea
level.
> If a Violation occurred during the dive, the SAT screen (Desaturation Time) will not be
displayed.
> After 2 hours on the Surface, FLY > SAT > WET (if the VT3 is wet) alternate.
116
WARNING: Prior to diving with the VT3, you
must also read and understand the Oceanic
Dive Computer Safety and Reference Manual,
Doc. No. 12-2262, which provides Important
Warnings and Safety Recommendations as
well as general product information.
GAUGE OPERATING MODE
117
GAUGE MODE
When Gauge Mode (GAUG) is selected as the Operating Mode, the VT3 will operate as
a Digital Depth Gauge/Timer without performing nitrogen and oxygen calculations.
 To access the GAUG SURF MAIN screen while NORM SURF MAIN is displayed,
press the M button for 2 seconds.
 To select GAUG as the Operating Mode to be used, press/release the M button while
the graphic GAUG is flashing. GAUG stops flashing and GAUG Mode is selected.
 If no GAUG dive has be conducted, press the M button for 2 seconds to access FREE
SURF MAIN.
NORM SURF MAIN > GAUG SURF MAIN > FREE SURF MAIN
GAUG SURF MAIN Display (Default), information provided includes (Fig. 100) > Graphic GAUG alternating with the Altitude Level graphic SEA (or EL2 through EL7)
and WET (if the unit is wet).
> Battery icon if an VT3 Low Battery Warning Condition exists,
flashing if Too Low.
> Tank Pressure with symbol PSI (or BAR), if the Receiver is
Linked with an active TMT.
> Symbol DIVE and Number of that dive.
> Symbols TIME and SURF, and Surface Interval Time (hr:min).
 Press the S button to activate the SmartGlo Backlight.
 Press/release the A button as necessary to access SURF
ALT, FLY, LOG, and HISTORY, similar to NORM Mode.
Fig. 100 - GAUG SURF MAIN
118
 Press/hold the A and S buttons simultaneously for 2
seconds to access the SET menu (F > A > U > T).
 Press/hold the S button for 2 seconds to access Battery/
TMT Status screens.
Upon descending to 5 FT (1.5 M), the VT3 will enter GAUG
DIVE Mode.
Gas Switching
and Buddy
Pressure checks
can not be performed in GAUG
Mode.
NOTE: Once a dive is made with the VT3 set for
GAUG Operating Mode, you must wait 24 hours
after surfacing before the VT3 resets and will
operate in NORM Mode (Air or Nitrox) or FREE
Dive Mode.
GAUG DIVE MAIN Display (Default),
information provided includes (Fig. 101) > Graphic GAUG.
> Tank Pressure with symbol PSI (or BAR), if the Receiver is
Linked with an active TMT.
> EDT (hr:min) with symbols DIVE and TIME
> Current Depth and FT (or M) icon.
 Press/release the A button to access GAUG DIVE ALT 1.
 Depress the A button for 2 seconds to acknowledge/silence
Alarms.
 Press the S button to activate the SmartGlo Backlight.
Fig. 101 - GAUG DIVE MAIN
119
GAUG DIVE ALT 1 Display,
Fig. 102 - GAUG DIVE ALT 1
information provided includes Fig. 102) > Day of the Week graphic (MON, TUE, etc.)
> Temperature with degrees icon and graphic F (or C)
> Time of Day (hr:min).
 Press/release the A button (< 2 sec) to view GAUG DIVE
ALT 2.
 The display will revert to the GAUG DIVE MAIN Display
after 5 seconds unless A is pressed.
GAUG DIVE ALT 2 Display,
information provided includes (Fig. 103) > Graphic TMT1 (or 2 or 3)
> Tank Pressure with the PSI (or BAR) icon, if TMT 1 is active
and linked
> EDT (hr:min) with symbols DIVE and TIME
> ATR (hr:min) with symbols AIR and TIME, if TMT 1 is active
and linked
> ATR (in decrements of 10 min) when =< 60 (min), if TMT 1
is active and linked
> Max Depth with icons FT (or M) and MAX
 The display will revert to the GAUG DIVE MAIN screen
after 5 seconds.
Fig. 103 - GAUG DIVE ALT 2
120
WARNING: Prior to diving with the VT3, you
must also read and understand the Oceanic
Dive Computer Safety and Reference Manual,
Doc. No. 12-2262, which provides Important
Warnings and Safety Recommendations as
well as general product information.
FREE DIVE OPERATING MODE
(Refer to additional information on page 159)
121
FREE DIVE MODE
When FREE (Free Dive Mode) is selected as the Operating Mode, the VT3 will operate as
a Digital Depth Gauge with select features.
Nitrogen loading is calculated based upon a default FO2 of AIR and the amount remaining during 24 hours is carried over between FREE and NORM Operating Modes.
FREE Mode Alarms and their Set Points are independent of those for NORM and GAUG
Mode, and they cannot be silenced.
 To access the FREE SURF MAIN screen while NORM GAUG MAIN is displayed (if no
GAUG Dive has been conducted, depress the M button for 2 seconds.
 To select FREE as the Operating Mode to be used, press/release the M button while
the graphic FREE is flashing. FREE stops flashing and FREE Mode is selected.
NORM SURF > GAUG SURF > FREE SURF MAIN
FREE SURF MAIN DISPLAY, information includes (Fig. 104) > Graphic FREE alternating with the Altitude Level graphic SEA
(or EL 2 through EL7) or graphic WET (if wet).
> Battery icon if an VT3 Low Battery Warning Condition exists,
flashing if Too Low.
> Graphic tot - with symbol DIVE and accumulated Total number
of repetitive FREE Dives conducted in that series.
> Symbols TIME and SURF and Surface Interval Time (min:sec
up to 59:59, then hr:min).
Fig. 104 - FREE SURF MAIN
122
 Press the S button to activate the SmartGlo Backlight.
 Depress the M button for 2 seconds to access NORM SURF
MAIN.
 Press and release the A button momentarily (< 2 seconds) to
access FREE SURF ALT 1.
 Press and release the A button momentarily (< 2 seconds) to
while viewing ALT 1 to access FREE SURF ALT 2.
 Depress the A button for 2 seconds to access the FREE SURF
CDT (CountDown Timer) STATUS screen, allowing you to
Set/Start/Stop the Timer.
 Depress the A and S buttons simultaneously for 2 seconds to
access the SET FREE EDT (Elapsed Dive Time) ALARM
Display from which you can then access the SET FREE
DEPTH ALARM 1/2/3 Displays.
FREE SURF ALT 1 Display, information includes (Fig. 105) > Day of the Week graphic (MON, TUE, etc.)
> Temperature with degrees icon and graphic F (or C)
> Time of Day (hr:min).
 Press and release the A button (< 2 seconds) to view FREE
SURF ALT 2.
 The display will revert to the FREE SURF MAIN screen after
5 seconds unless A is pressed.
Fig. 105 - FREE SURF ALT 1
123
FREE SURF ALT 2 Display, information includes (Fig. 106) -
Fig. 106 - FREE SURF ALT 2
> Graphic FREE
> Battery icon if an VT3 Low Battery Warning Condition
exists, flashing if Too Low.
> Graphic LASt with symbols DIVE TIME and the Elapsed Dive
Time (min:sec) of the FREE dive previously made while still
in FREE MODE. Resets to 0:00 after 24 hours.
> Symbols MAX and FT (or M) and the Maximum Depth of the
FREE dive previously made while still in FREE MODE.
 Press the S button to activate the Backlight.
The display will revert to the FREE SURF MAIN screen after 5
seconds.
FREE MODE COUNTDOWN TIMER (CDT)
Depressing the A button for 2 seconds while viewing the FREE
SURF MAIN screen will access the FREE SURF CDT STATUS
screen.
FREE SURF CDT STATUS Display,
Fig. 107 - FREE SURF CDT
STATUS
124
information includes (Fig. 107) > Graphics TIMR and OFF (or ON), flashing
> TIME symbol and remaining Countdown time (min:sec) with
the colon flashing, if ON and a CD is in progress.
> 0:00 (min:sec) will be displayed with the colon flashing, if
the CD Timer is ON and no time is remaining.
> If the CD Timer is OFF, the CD Time (min:sec) previously set will be displayed with the
colon solid.
 Pressing and releasing the S button momentarily (< 2 seconds) will toggle between
ON and OFF.
> If a Time has been set, a toggle from OFF to ON will start the CD Timer indicated by
the colon flashing.
 Press the S button to activate the SmartGlo Backlight.
 Pressing/releasing the A button momentarily (< 2 seconds) will revert the Display to
the FREE SURF MAIN screen.
 Depressing the A and S buttons simultaneously for 2 seconds while viewing the CD
Timer Status screen when the CD Timer is OFF will access the SET CD TIMER screen
with the MINUTE Set Point flashing.
NOTES: Once the CD TIMER has been Set and Started (by selecting
ON), it will continue to run in the background while on the surface
until turned OFF (stopped) or the Time reaches 0:00 at which time the
Alarm will strike (3 short beeps 3 times), the message TIMR will be
displayed, and the CD TIMER will revert to OFF.
Upon descending to 5 FT/1.5 M for 5 seconds (i.e., entry into FREE
DIVE Mode), CD TIMER operation will continue, if in progress.
During a dive, the CD TIMER can be turned OFF (stopped) and ON
(started), but not Set.
125
SET FREE CDT STATUS Display (Surface only),
Fig. 108 - SET FREE CDT
Fig. 109 - FREE CDT SET
(ready to Start)
126
information includes (Fig. 108) > Graphics TIMR and SEt, solid.
> TIME symbol and Timer setting (min:sec), colon solid,
MINUTE Set Point flashing.
 Depressing and holding the S button while the MINUTE Set
Point is flashing will scroll through the Set Points at a rate of
4 per second from 0: to 59: in 1 Minute (1:) increments.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the MINUTE Set Point displayed and
advance to Set SECONDS with the Set Point flashing.
 Depressing and holding the S button while the SECONDS
Set Point is flashing will scroll through the Set Points at a
rate of 4 per second from :00 to :59 in 1 Second (:01)
increments.
 Pressing and releasing the A button momentarily (< 2
seconds) will save the CD Timer Set Point indicated by the
graphic OFF flashing (Fig. 109) in place of the graphic SEt.
 Pressing and releasing S button momentarily (< 2 seconds)
will toggle to ON and Start the CD TIMER.
 Pressing the A button momentarily (< 2 seconds, or if the M
button is depressed for 2 seconds, or if no button is pressed
during a period of 2 minutes, the Display will revert to the
FREE SURF MAIN screen.
FREE DIVE EDT (ELAPSED DIVE TIME) ALARM
The FREE EDT Alarm is factory set for 30 seconds. When set ON, the Alarm will sound 3
short beeps and the message TIME will be displayed momentarily every 30 seconds while
the VT3 is operating underwater in FREE DIVE Mode.
 Depressing the A and S buttons simultaneously for 2 seconds while the FREE SURF
MAIN screen is displayed, will access SET FREE EDT ALARM with the Set Point
flashing.
NOTE: The FREE EDT Alarm can only be Set (turned OFF or ON) while
on the Surface and can not be changed during a Dive.
SET FREE EDT ALARM Display, information includes (Fig. 110) -
> Graphic EDT.
> Set Point OFF or ON, flashing.
 Pressing and releasing the S button momentarily (< 2
seconds) will toggle the Set Point between OFF and ON.
 Pressing the A button momentarily (< 2 seconds) will accept
the setting and access the SET FREE DEPTH ALARM 1
screen.
 Depressing the M button for 2 seconds, or if no button is
pressed during a period of 2 minutes, the display will revert
to the FREE SURF MAIN screen.
Fig. 110 - SET FREE EDT
ALARM
127
FREE DIVE DEPTH ALARMS (FDA)
Responsible
128
The VT3 features 3 FREE Dive DEPTH Alarms that can be Set at
progressively deeper Depths and turned OFF/ON.
> If Alarm 1 is set OFF, then Alarms 2 and 3 will be disabled.
> If Alarm 2 is set OFF, Alarm 3 will be disabled.
When each of the Depths are reached during a dive, 3 short
beeps will sound 3 times and the message DPTH will be displayed 3 times.
 Pressing the A button momentarily (< 2 seconds) while the
SET FREE EDT ALARM screen is displayed will access SET
FREE DEPTH ALARM 1 with the Set Point flashing.
Sequence of FREE Mode Alarm Setting Access:
FREE SURF MAIN  press A and S 2 seconds >>>>
SET FREE EDT AL  press A less than 2 seconds >>>>
SET FREE DEPTH AL 1  press A less than 2 seconds >>>>
SET FREE DEPTH AL 2  press A less than 2 seconds >>>>
SET FREE DEPTH AL 3  press A less than 2 seconds >>>>
FREE SURF MAIN
SET FREE DEPTH ALARM 1 (FDA 1) Display,
information includes (Fig. 111) > Graphic FDA1.
> Set Point ON or OFF, flashing.
> Depth Set Point graphic value, flashing if ON is displayed.
> Symbols MAX and FT (or M).
 Pressing and releasing the S button momentarily (< 2
seconds) will toggle the Set Point between ON and OFF.
 If set ON, the Depth value displayed will flash.
> Pressing and releasing the S button momentarily and
repeatedly (< 2 seconds each time) will step through the Set
Points from 30 to 330 FT (10 to 100 M) in increments of
10 FT (1 M) at a rate of 1 Set Point per press of the button.
> Pressing and holding the S button will scroll through the Set
Points at a rate of 4 Set Points per second until released.
> Pressing the A button momentarily (< 2 seconds) will accept
the Depth Setting and advance to SET FREE DEPTH ALARM
2.
 If set OFF, pressing the A button momentarily will accept the
Setting and revert operation to the FREE SURF MAIN
screen, bypassing SET FREE DEPTH ALARMS 2 and 3.
 Depressing the M button for 2 seconds, or if no button is
pressed during a period of 2 minutes, the display will revert
to the FREE SURF MAIN screen.
Fig. 111 - SET FREE DEPTH
ALARM 1
129
SET FREE DEPTH ALARM 2 (FDA 2) Display,
NOTE: The range information includes (Fig. 112) of available FDA 2
> Graphic FDA2.
Set Points begins at > Set Point ON or OFF, flashing.
the next FT/M value > Depth Set Point graphic value, flashing if ON is displayed.
greater than the
> Symbols MAX and FT (or M).
FDA 1 Alarm Set
Point.
 Pressing and releasing the S button momentarily (< 2
seconds) will toggle the Set Point between ON and OFF.
 If set ON, the Depth value displayed will flash.
> Pressing and releasing the S button momentarily and
repeatedly (< 2 seconds each time) will step through the Set
Points from 40 to 330 FT (11 to 100 M) in increments of
10 FT (1 M) at a rate of 1 Set Point per press of the button.
> Pressing and holding the S button will scroll through the Set
Points at a rate of 4 Set Points per second until released.
> Pressing the A button momentarily (< 2 seconds) will accept
the Depth Setting and advance to SET FREE DEPTH ALARM
3.
 If set OFF, pressing the A button momentarily will accept the
Setting and revert operation to the FREE SURF MAIN
screen, bypassing SET FREE DEPTH ALARM 3.
 Depressing the M button for 2 seconds, or if no button is
pressed during a period of 2 minutes, the display will revert
to the FREE SURF MAIN screen.
Fig. 112 - SET FREE DEPTH
ALARM 2
130
SET FREE DEPTH ALARM 3 (FDA3) Display,
information includes (Fig. 113) > Graphic FDA3.
> Set Point ON or OFF, flashing.
> Depth Set Point graphic value, flashing if ON is displayed.
> Symbols MAX and FT (or M).
 Pressing and releasing the S button momentarily (< 2
seconds) will toggle the Set Point between ON and OFF.
 If set ON, the Depth value displayed will flash.
> Pressing and releasing the S button momentarily and
repeatedly (< 2 sec each time) will step through the Set
Points from 50 to 330 FT (12 to 100 M) in increments of
10 FT (1 M) at a rate of 1 Set Point per press of the button.
> Pressing and holding the S button will scroll through the Set
Points at a rate of 4 Set Points per second until released.
> Pressing the A button momentarily (< 2 sec) will accept the
Depth Setting and advance to SET FREE DEPTH ALARM 3.
 If set OFF, pressing the A button momentarily will accept the
Setting and revert operation to the FREE SURF MAIN
screen.
 Depressing the M button for 2 seconds, or if no button is
pressed during a period of 2 minutes, the display will revert
to the FREE SURF MAIN screen.
NOTE: The range
of available FDA 3
Set Points begins at
the next FT/M value
greater than the
FDA 2 Alarm Set
Point.
Fig. 113 - SET FREE DEPTH
ALARM 3
131
FREE DIVE MAIN Display (Default),
Fig. 114 - FREE DIVE MAIN
Fig. 115 - FREE DIVE ALT
132
information includes (Fig. 114) > Graphic FREE
> TLBG, if any Nitrogen remaining from previous NORM or
FREE Dives conducted within the previous 24 hours.
> Temperature with degrees symbol and graphic F (or C)
> Elapsed Dive Time (hr:min) with symbols DIVE and TIME
> Dive Time Remaining (hr:min) with symbols TIME and NDC
> Current Depth and symbol FT (or M).
 Press and release the A button momentarily (< 2 seconds) to
access the FREE DIVE ALT screen for 5 seconds.
 Depress the A button for 2 seconds to access the FREE CDT
(Count Down Timer) STATUS screen.
 Press the S button to activate the SmartGlo Backlight.
FREE DIVE ALT Display, information includes (Fig. 115) > Day of the Week graphic (MON, TUE, etc.)
> Temperature with degrees icon and graphic F (or C)
> Time of Day (hr:min).
 The display will revert to the FREE DIVE MAIN screen after
5 seconds.
FREE DIVE CDT STATUS Display,
information includes (Fig. 116) > Graphics TIMR and OFF (or ON), flashing
> TIME symbol and remaining Countdown time (min:sec) with
the colon flashing if ON and a CD is in progress, 0:00
with the colon flashing if ON and no time is remaining. If
OFF, the CD Time previously set while on the surface is to
be displayed with the colon solid.
 Pressing and releasing the S button momentarily (< 2
seconds) will toggle between OFF and ON. If a Time has
been set, a toggle from OFF to ON will Start the CD TIMER
indicated by the colon flashing (Fig. 117).
 Pressing the S button will activate the SmartGlo Backlight.
 Pressing and releasing the A button momentarily (< 2
seconds) will revert to the FREE DIVE MAIN screen.
 If no button is pressed during a period of 10 seconds, the
display will revert to the FREE DIVE MAIN screen.
Fig. 116 - FREE DIVE CDT
STATUS (OFF, ready to Start)
FREE DIVE ALARMS
All FREE Dive Alarms will sound 3 short beeps (1 or 2 times) and
display a graphic Message as an indication that an event is
occurring and as a reminder to view the display to identify the
event. After the beeps have sounded, the Alarm Message will
be replaced with the graphic FREE.
Fig. 117 - FREE DIVE CDT
STATUS (ON, Running)
133
Fig. 118 - FREE DIVE MAIN
(During CDT ALARM)
Fig. 119 - FREE DIVE MAIN
(During DEPTH ALARM)
134
FREE DIVE Alarms are separate and unaffected by NORM/
GAUG Mode Alarm Settings, and the Alarms that occur in those
Modes are separate and unaffected by FREE DIVE Alarm Settings.
FREE CDT (Count Down Timer) ALARM
When the FREE CDT decreases to 0:00 (min:sec), 3 short beeps
will sound 3 times, the red LED will flash, and the Message TIMR
will appear on the display 3 times momentarily (Fig. 118), then
revert to the Message FREE.
FREE DIVE DEPTH ALARM(S)
When Depth reaches the FREE DEPTH ALARM 1 Set Point, 3
short beeps will sound 3 times, the red LED will flash, and the
Message DPTH will appear on the display 3 times momentarily
(Fig. 119), then revert to the Message FREE.
The beeps and Message will be repeated when Depth reaches
the FREE DEPTH ALARM 2 and 3 Set Points, if set ON.
If Ascent is made above a FREE DEPTH ALARM Set Point and
then a descent is made to a Depth below it, the respective Depth
Alarm will sound again.
FREE DIVE EDT (Elapsed Dive Time) ALARM
When the FREE EDT Alarm is set ON prior to commencing a
FREE Dive, 3 short beeps will sound, the red LED will flash, and
the Message TIME will appear on the display momentarily (Fig.
120), then revert to the Message FREE.
This FREE DIVE Alarm is factory set to repeat every 30 seconds
during FREE DIVE Mode, when it is set ON prior to the dive.
FREE DIVE TLBG (Tissue Loading Bar Graph) ALARM
While diving in FREE DIVE Mode, nitrogen accumulation from
the FREE Dives in that set and any previous NORM Dives conducted within 24 hours is displayed as the TLBG.
When Nitrogen Loading increases to the Caution level indicated
by 7 segments displayed as the TLBG and the UP Arrow appearing solid, 3 short beeps will sound 3 times, the red LED will
flash, and the Message UP > HIGH > NI will appear on the
display (Fig. 121).
After the beeps, the Message will continue to scroll until the
TLBG recedes to 6 segments at which time the Message will
change to FREE and the UP Arrow will be removed.
Fig. 120 - FREE DIVE MAIN
(During EDT ALARM)
Fig. 121 - FREE DIVE MAIN
(During TLBG ALARM)
135
Fig. 122 - FREE DIVE MAIN
(During DECO)
ENTRY INTO DECO DURING A FREE DIVE
In the event that Nitrogen Loading increases to the Warning
level indicated by all segments of the TLBG and O2BG and UP
Arrow flashing, 3 short beeps will sound 3 times, the red LED
will flash, and the Message UP > VIOL will appear on the
display (Fig. 122).
After the beeps, the message UP > VIOL will continue to be
displayed scrolling until you surface, then the graphic VIOL will
alternately be On/Off for 10 minutes after the dive.
Upon surfacing, the UP Arrow will be removed, however, the Full
TLBG and O2BG will continue to flash for 24 hours (Fig. 123).
Operation will be as Permanent Violation Mode and access to
NORM and GAUG Modes will be blocked until a full 24 hours
elapse with no diving.
NOTES:
Nitrogen (TLBG) and Oxygen (O2BG) are carried
over between FREE and NORM Modes.
Fig. 123 - FREE SURF MAIN
(During DECO)
136
Dive Time Remaining (until Deco or High O2) is
calculated during FREE Mode based FO2 of Air,
but not displayed.
WARNING: Prior to diving with the VT3, you
must also read and understand the Oceanic
Dive Computer Safety and Reference Manual,
Doc. No. 12-2262, which provides Important
Warnings and Safety Recommendations as
well as general product information.
REFERENCE
137
UPLOADING SETTINGS AND DOWNLOADING DATA
The VT3 is configured with a Data Port located on the back of the left side that enables it to
be connected to a PC through a USB port using the special Interface Cable supplied.
A USB Driver is provided on the OceanLog CD as part of the Interface System.
The Settings Upload feature can be used to set/change the VT3’s Set A group (Alarms),
Set U group (Utilities), and Set T group (Date/Time) using the Interface System. The Set F
group (FO2) and FREE Mode Alarms must be entered using the VT3's control buttons.
Information available for retrieval (DownLoad) from the VT3 to the PC OceanLog program
includes dive number, surface interval time, maximum depth, elapsed dive time, start date,
start time, lowest temperature under water, sampling rate, dive profile, VT3's set points,
pressure, Air Time Remaining, OTU, OTS, ascent rate, TLBG, O2BG, and Gas Switching
events/pressures/FO2s.
The VT3 checks for the presence of an interface device connection to the Data Port once
every second while in Surface Mode. Checks are not made if the Wet Activation contacts
are wet. Upon sensing an interface connection, the requesting device (PC) connects to the
VT3 and is prepared for Upload of settings or Download of data which are then initiated
using the PC OceanLog program.
Prior to attempting to Download data from your VT3 or Upload Settings to it, review the
HELP section of the OceanLog program. Recommended is to print those sections of HELP
that you consider appropriate for your Interface activities.
138
PC compatibility requirements:
 IBM , or compatible, Personal Computer with USB Port
 Intel®® Pentium 200 MHz or better microprocessor
 Microsoft Windows® 98 Second Edition, ME, NT, 2000, or XP
 Super VGA® card or compatibl
e video graphics adaptor (256 color or greater) with a
minimum 800 X 600 pixel screen area of display settings
 16MB of available RAM
 20MB of available hard drive storage
 Mouse
 CD Rom drive
 Printer (optional)
For software updates, refer to the Oceanic web site.
www.OceanicWorldwide.com
For support, call OceanLog Support toll free at -
(866) 732-7877, 8 Am to 5 Pm Pacific time.
139
CARE AND CLEANING
Protect your VT3 from shock, excessive temperatures, exposure
to chemicals, and tampering. Protect the lens against scratches
with a Instrument Lens Protector. Small scratches will naturally
disappear underwater.
 Soak and rinse the VT3 in fresh water at the end of each
day of diving, and check to ensure that the areas around
the Low Pressure (Depth) Sensor (Fig. 124a), PC Interface
Data Port (Fig. 124b), and Buttons are free of debris or
obstructions. Soak and rinse the Regulator(s) with the
Transmitter(s) attached.
 To dissolve salt crystals, use lukewarm water or a slightly
acidic bath (50% white vinegar/50% fresh water). After
removal from the bath, place the VT3 and the Regulator(s)
with Transmitter(s) unit under gently running water and
towel dry before storing.
 Transport your VT3 system cool, dry, and protected.
b
a
Fig. 124 - VT3 CASE BACK
140
INSPECTIONS AND SERVICE
Your VT3 should be inspected annually by an Authorized
Oceanic Dealer who will perform a factory prescribed function
check and inspection for damage or wear. To keep the 2 year
limited warranty in effect, this inspection must be completed
one year after purchase (+/- 30 days).
Oceanic recommends that you continue to have an inspection performed every year to
ensure it is working properly. The costs of annual inspections are not covered under the
terms of the 2 year limited warranty.
To Obtain Service:
Take your VT3 system to an Authorized Oceanic Dealer or send it to the nearest Oceanic
Regional Distributor Facility (page 173).
To return your VT3 system to Oceanic:
 Record all dive data in the Log and/or download the data in memory. All data will
be erased during factory service.
 Package it using a protective cushioning material.
 Include a legible note stating the specific reason for return, your name, address,
daytime phone number, serial number(s), and a copy of your original sales receipt
and Warranty Registration Card.
 Send freight prepaid and insured using a traceable method to the nearest Oceanic
Regional Service Facility, or to Oceanic USA.
 If shipping to Oceanic USA, obtain an RA (Return Authorization) number by
contacting Oceanic at 510/562-0500 or send an e-mail to service@oceanicusa.com.
 Non-warranty service must be prepaid. COD is not accepted.
 Additional information is available at the Oceanic web site OceanicWorldwide.com
141
BATTERY REPLACEMENT
NOTE: The procedures that follow must be closely adhered to. Damage due to improper Battery replacement is not covered by the VT3's
2 year warranty.
When replacing the Battery in the VT3, it is recommended that you
also replace the Battery(s) in the Transmitter(s), and vice-versa.
The Battery Compartment(s) should only be opened in a dry and clean environment with
extreme care taken to prevent the entrance of moisture or dust.
As an additional precautionary measure to prevent formation of moisture in the Battery
Compartment(s), it is recommended that the Battery(s) be changed in an environment
equivalent to the local outdoor temperature and humidity (e.g., do not change the
Battery(s) in an air conditioned environment then take it outside during a hot sunny day).
Inspect the Buttons, Lens, and Housing(s) to ensure they are not cracked or damaged. If
there is any sign of moisture in the VT3 or Transmitter(s), DO NOT attempt to use the VT3
for diving (NORM, GAUG, or FREE) until it receives proper service by the Oceanic
factory or an Authorized Regional Distributor.
Hot Swap
If the new Battery can be inserted into the VT3 within 8 seconds after the old one is
removed (referred to as a Hot Swap), settings and nitrogen and oxygen calculations for
repetitive dives will be retained.
142
VT3 Battery Hatch Removal
 Locate the Battery Compartment on the back of the module.
 While applying steady inward pressure on the clear Battery
Hatch, rotate the Hatch Ring clockwise 10 degrees by
pressing on the upper/right arm of the Ring with a small
blade screwdriver (Fig. 125).
NOTE: If available, an adjustable face spanner
tool or pointed pliers can be used by inserting
the tips of the tool in the small holes in the Ring
(Fig. 126).
Fig. 125 - BATTERY HATCH
REMOVAL (Tool)
 Lift the Hatch Ring up and away from the Housing.
 Remove the clear Battery Hatch.
VT3 Battery Removal
 Remove the Retaining Bar located across the lower portion of
the Battery (Fig. 127a).
 Remove the Hatch O-ring. DO NOT use tools
 Using care not to damage the Battery Contacts (Fig. 127 b/
c), slide the Battery up and out of the right side of the Battery
Compartment.
NOTE: DO NOT allow a metal object to short
circuit the top of the Battery which is positive (+)
to the negative ( - ) contact of the Compartment.
Fig. 126 - ALTERNATE
HATCH REMOVAL
b
a
c
Fig. 127 - VT3 BATTERY
REMOVAL
143
Transmitter Battery Removal
Locate the Battery Hatch on the End of the Housing:
 Apply a coin to the recessed slot of the Hatch and turn it
counter clockwise out of the Housing (Fig. 128).
 Remove the Battery from the Battery Compartment and
discard according to local regulations governing disposal
of Lithium batteries.
VT3 and Transmitter Inspection
 Closely check all of the sealing surfaces for any signs of
damage that might impair proper sealing.
 Inspect the Buttons, Lens, and Housing(s) to ensure they are
not cracked or damaged.
WARNING: If damage or corrosion is found,
return your VT3 system to an Authorized Oceanic Dealer, and DO NOT attempt to use it until
it has received factory prescribed service.
Fig. 128 - TMT BATTERY
HATCH REMOVAL
144
 Remove the Battery Hatch O-ring(s) and inspect them for
any signs of deterioration or deformity. DO NOT use tools
to remove the O-ring(s).
 To ensure proper sealing, O-ring replacement is highly
recommended each time a Battery is replaced.
 Closely examine all threads for any signs of damage that
might prevent proper threading.
Inspection (continued) -
 Closely examine the inside of the Battery Compartment(s) for any signs of corrosion
indicating entrance of moisture into the unit.
 If corrosion is found, return the VT3 system to an Authorized Oceanic Dealer, and DO
NOT attempt to use it until it has received factory service.
 If moisture is found, it is best to have the unit inspected and cleaned by an Authorized
Oceanic Dealer.
 If it is necessary to clean the Battery Compartment, flush it and all components with a
solution of 50% white vinegar and 50% fresh water. Rinse with fresh water, and
allow to dry overnight, or blow dry with a hair dryer set at no heat.
VT3 Battery Installation
 Slide a new 3 volt type CR2450 Lithium Battery, negative ( - ) side down into the
Battery Cavity. Slide it in from the right side and ensure that it slides under the contact
clip on the left rim of the cavity.
 Orient the Retaining Bar across the lower portion of the Battery and carefully push it
down into position.
 Replace the Hatch O-ring with a new one. This O-ring must
be a genuine Oceanic part that can be purchased from an
Authorized Oceanic Dealer. Use of any other O-ring will
void the warranty.
 Lightly lubricate the new Hatch O-ring with silicone grease
and place it on the inner rim of the Battery Hatch. Ensure
that it is evenly seated.
 Slide the Hatch Ring, top portion first (small opening), onto
your thumb (Fig. 129).
Fig. 129 - VT3 BATTERY
INSTALLATION
145
VT3 Battery Installation (continued) -
Fig. 130 - TIGHTENING
VT3 HATCH RING
 Carefully place the clear Battery Hatch (with O-ring) into
position on the rim of the Battery Compartment, then press it
evenly and completely down into place with your same
thumb.
 Maintain the Battery Hatch securely in place and, using your
other hand, slide the Hatch Ring down off your thumb and
into position around the Battery Compartment. The tabs on
the Ring fit down into the slots located at the 2 and 9 o'clock
positions.
 Using your fingers, turn the Ring counter clockwise 5 degrees until the tabs engage, then tighten it 5 more degrees
by turning it counter clockwise with the aide of a small blade
screwdriver or spanner tool, pressing against the upper/left
arm of the Ring (Fig. 130).
Transmitter Battery Installation
 Lightly lubricate the new Battery Cap O-ring with silicone
grease and install it onto the Battery Cap. DO NOT roll
the O-ring over the Threads, instead stretch it slightly to
work it down over the slotted end of the Cap into the
Groove at the Base of the Threads (Fig. 131).
Fig. 131 - TRANSMITTER
O-RING INSTALLATION
146
NOTE: The TMT's O-ring must be a genuine
Oceanic part that can be purchased from an
Authorized Oceanic Dealer.
Transmitter Battery Installation (continued) -
 Place a new 3 volt, CR2, Lithium Battery (Duracell model DLCR2 or equivalent) positive (+) side down into the Battery
Compartment with the negative end facing up/out (Fig.
132).
 Ensure that the Battery is properly oriented and the Hatch
O-ring is evenly seated around the Battery Hatch.
 Carefully place the Battery Hatch with Spring into the
Housing and turn clockwise slowly by hand to ensure
proper threading. Apply a coin and tighten until secure.
The outer surface of the Battery Hatch should be flush with
the outer surface of the Housing (Fig. 133).
Battery
(+) ( - )
Fig. 132 - TMT BATTERY
ORIENTATION
VT3 System Testing
 Pressurize the Regulator Assembly (and Transmitter).
 Activate the VT3 and watch carefully as it performs a full
diagnostic and battery check, and enters Surface Mode.
Observe the LCD display to ensure it is consistently clear
and sharp in contrast throughout the screen.
 If any portions of the display are missing or appear dim, or
if a Low Battery Condition is indicated, return your VT3 to
an Authorized Oceanic Dealer for a complete evaluation
before attempting to use it.
 Verify that Tank Pressure is displayed.
 Verify all Set Points prior to diving.
 Press the S button for 2 seconds to check the Status screens.
Fig. 133 - TMT BATTERY
HATCH INSTALLED
147
INSTALLING A TRANSMITTER ON A REGULATOR
To install the Transmitter on the Regulator First Stage:
 Remove the existing Pressure Gauge and High Pressure
Hose, or the High Pressure Port Plug from the Port marked
HP using the proper size Hex Key.
 Lightly lubricate the O-ring and Threads of the Transmitter
fitting with a halocarbon based lubricant such as ChristoLube MCG111 (provided in Oceanic Battery Kits).
 Thread the Transmitter clockwise by hand into the
Regulator's HP Port (Fig. 134) and tighten until secure with
a 5/8" open-end wrench.
 Attach the Regulator First Stage to a full Scuba Tank and
pressurize by slowly opening the Tank Valve, listening for
any indication of air leaking around the Fitting.
 If air leakage is present, DO NOT use, take the complete
Regulator Assembly to an Authorized Oceanic dealer for
inspection and service.
TRANSMITTER COMPATIBILITY WITH NITROX
When packaged and shipped from the factory, Oceanic VT3
Transmitters are rated for use with compressed Air and/or
nitrogen-oxygen (Nitrox) breathing gas mixtures containing up to
99% O2 by volume and with 100% O2.
Fig. 134 -INSTALLING A
TMT ON A REGULATOR
148
ALTITUDE SENSING AND ADJUSTMENT
Prior to the first dive of a series of repetitive dives, ALTITUDE (i.e., Ambient Pressure) is
measured upon activation and every 15 minutes until a dive is made.
> Measurements are taken every 15 minutes during the 24 hour period after surfacing.
> Measurements are only taken when the unit is dry.
> Two readings are taken, the second reading 5 seconds after the first. The readings
must be within 1 foot (30 cm) of each other to record that Ambient Pressure as the
current ALTITUDE.
The Mathematical Model in the VT3 accounts for the reduced No Decompression dive
Time available based on National Oceanic and Atmospheric Administration (NOAA)
guidelines.
When diving in high altitude waters from 3,001 to 14,000 feet (916 to 4,270 meters), the
VT3 automatically adjusts to these conditions providing corrected Depth, reduced No
Decompression Times, and reduced Oxygen Accumulation Times at intervals of 1,000 feet
(305 meters).
No adjustments are made during any time that the Wet Contacts are bridged.
At an elevation of 3,001 feet, Depth Calibration automatically changes from feet of
seawater to feet of fresh water. This is the first adjustment to the Algorithm.
149
When the Conservative Factor feature is set ON, allowable dive times are calculated
based upon the next higher 3,000 foot (915 meter) Altitude. All adjustments for
Altitudes greater than 11,000 feet (3,355 meters) are then made to allowable dive
times for 14,000 feet (4,270 meters). If the Conservative Factor is set ON while at
Sea Level, calculations are based upon an Altitude of 3,001 feet.
The VT3 will not function above 14,000 feet (4,270 meters).
IMPERIAL NO DECOMPRESSION LIMITS (HOURS:MINUTES) AT ALTITUDE
Altitude 0`
(feet)
to
3000`
Depth
(feet)
30
4:20
40
2:17
50
1:21
60
0:57
70
0:40
80
0:30
90
0:24
100
0:19
110
0:16
120
0:13
130
0:11
140
0:09
150
0:08
160
0:07
170
0:07
180
0:06
190
0:05
150
3001` 4001` 5001` 6001` 7001` 8001` 9001`10001`11001`12001`13001`
to
to
to
to
to
to
to
to
to
to
to
4000` 5000` 6000` 7000` 8000` 9000`10000`11000`12000`13000`14000`
3:21
1:43
1:03
0:43
0:31
0:24
0:19
0:15
0:12
0:09
0:08
0:07
0:06
0:06
0:05
0:05
0:04
3:07
1:36
1:00
0:40
0:30
0:23
0:18
0:14
0:11
0:09
0:08
0:07
0:06
0:05
0:05
0:05
0:04
2:55
1:30
0:58
0:38
0:28
0:21
0:17
0:13
0:10
0:08
0:07
0:06
0:06
0:05
0:05
0:04
0:04
2:45
1:25
0:55
0:36
0:27
0:20
0:16
0:12
0:09
0:08
0:07
0:06
0:05
0:05
0:04
0:04
0:04
2:36
1:20
0:52
0:34
0:26
0:19
0:15
0:11
0:09
0:08
0:07
0:06
0:05
0:05
0:04
0:04
0:04
2:28
1:16
0:48
0:33
0:24
0:18
0:14
0:10
0:08
0:07
0:06
0:06
0:05
0:05
0:04
0:04
0:04
2:21
1:12
0:45
0:31
0:23
0:17
0:13
0:10
0:08
0:07
0:06
0:05
0:05
0:04
0:04
0:04
0:03
2:15
1:09
0:43
0:30
0:22
0:16
0:12
0:09
0:08
0:07
0:06
0:05
0:05
0:04
0:04
0:04
0:03
2:10
1:06
0:41
0:29
0:20
0:16
0:11
0:09
0:07
0:06
0:06
0:05
0:04
0:04
0:04
0:03
0:03
2:04
1:03
0:39
0:28
0:19
0:14
0:10
0:08
0:07
0:06
0:05
0:05
0:04
0:04
0:04
0:03
0:03
1:58
1:01
0:37
0:27
0:18
0:13
0:10
0:08
0:07
0:06
0:05
0:05
0:04
0:04
0:03
0:03
0:03
METRIC NO DECOMPRESSION LIMITS (HOURS:MINUTES) AT ALTITUDE
Altitude
(meters)
0`
916` 1221` 1526` 1831` 2136` 2441` 2746` 3051` 3356` 3661` 3966`
to
to
to
to
to
to
to
to
to
to
to
to
915` 1220` 1525` 1830` 2135` 2440` 2745` 3050` 3355` 3660` 3965` 4270`
Depth
(meters)
9
4:43
12
2:24
15
1:25
18
0:59
21
0:41
24
0:32
27
0:25
30
0:20
33
0:17
36
0:14
39
0:11
42
0:09
45
0:08
48
0:07
51
0:06
54
0:06
57
0:05
3:37
1:52
1:06
0:45
0:33
0:26
0:19
0:16
0:12
0:10
0:08
0:07
0:06
0:06
0:05
0:05
0:04
3:24
1:44
1:03
0:42
0:31
0:24
0:18
0:15
0:11
0:09
0:08
0:07
0:06
0:06
0:05
0:05
0:04
3:10
1:37
1:00
0:40
0:29
0:22
0:17
0:13
0:11
0:09
0:07
0:07
0:06
0:05
0:05
0:04
0:04
2:58
1:30
0:57
0:38
0:28
0:21
0:16
0:12
0:10
0:08
0:07
0:06
0:06
0:05
0:05
0:04
0:04
2:48
1:25
0:55
0:36
0:27
0:20
0:16
0:12
0:09
0:08
0:07
0:06
0:05
0:05
0:04
0:04
0:04
2:39
1:21
0:52
0:34
0:26
0:19
0:14
0:11
0:09
0:07
0:06
0:06
0:05
0:05
0:04
0:04
0:04
2:31
1:17
0:49
0:32
0:24
0:18
0:13
0:10
0:08
0:07
0:06
0:05
0:05
0:04
0:04
0:04
0:03
2:24
1:13
0:46
0:31
0:23
0:17
0:12
0:10
0:08
0:07
0:06
0:05
0:05
0:04
0:04
0:04
0:03
2:18
1:10
0:43
0:30
0:21
0:16
0:12
0:09
0:08
0:06
0:06
0:05
0:05
0:04
0:04
0:03
0:03
2:12
1:07
0:41
0:29
0:20
0:15
0:11
0:09
0:07
0:06
0:05
0:05
0:04
0:04
0:04
0:03
0:03
2:07
1:04
0:39
0:28
0:19
0:14
0:10
0:08
0:07
0:06
0:05
0:05
0:04
0:04
0:04
0:03
0:03
OXYGEN EXPOSURE LIMITS
(from NOAA Diving Manual)
PO2
(ATA)
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.40
1.50
1.60
Max Duration
Single Exposure
(min) (hr)
720 12.0
570
9.5
450
7.5
360
6.0
300
5.0
240
4.0
210
3.5
180
3.0
150
2.5
120
2.0
45
.75
Max Total Duration
24 Hour Day
(min)
(hr)
720
12.0
570
9.5
450
7.5
360
6.0
300
5.0
270
4.5
240
4.0
210
3.5
180
3.0
180
3.0
150
2.0
151
SPECIFICATIONS
CAN BE USED AS
• Dive Computer (Air or Nitrox)
• Digital Depth Gauge/Timer
• Free Dive activity
• With or without up to 3 Transmitters
NO DECOMPRESSION MODEL
Basis:
• Modified Haldanean Algorithm
• 12 tissue compartments
Data Base:
• Diving Science and Technology (DSAT) - Rogers/
Powell
Dive Computer Performance:
• Tissue compartment halftimes (mins.) Spencer’s “M”
values
5, 10, 20, 40, 80, 120, 160, 200, 240, 320, 400, 480
• Reciprocal subsurface elimination
• 60 minute surface credit control for compartments
faster than 60 minutes
• Tissue compartments tracked up to 24 hours after
last dive
Decompression Capabilities (stop ceilings):
• 10, 20, 30, 40, 50, and 60 FT
(3, 6, 9, 12, 15, and 18M)
Altitude Algorithm and Oxygen Exposure Limits:
• Based on NOAA tables
152
TRANSMITTERS
• Battery and Pressure check
> every 2 minutes when asleep
> every 2 seconds when awake
• Startup
> Pressure equal or greater than 120 PSI (8 BAR)
> Battery equal or greater than 2.75 volts
• Shutdown
> Pressure less than 50 PSI (3.5 BAR)
SURFACE SEQUENCE/MODES
• NORM/GAUG/FREE Surface Mode
• Plan (30 to 190 FT/9 to 57 M) - NORM only
• Time to Fly Countdown - NORM/GAUG
• Time to Desaturation Countdown - NORM only
• Dive Log - NORM/GAUG
• History - NORM/GAUG
• Battery/Tank Pressure Status - NORM/GAUG
• Set FO2, Alarms, Utilities, Time - NORM/GAUG
FREE MODE SETTINGS
• Count Down Timer (0:00 to 59:59 min:sec)
• Elapsed Dive Time Alarm (Off/On) - fixed every 30 sec
• Depth Alarm 1 (30 to 330 FT /10 to 100 M)
• Depth Alarm 2 (40 to 330 FT /11 to 100 M)
• Depth Alarm 3 (50 to 330 FT /12 to 100 M)
• TLBG Alarm - fixed at 7 segments
• DECO Alarm - fixed at 8 TLBG segments
SPECIFICATIONS (CONTINUED)
NORM/GAUG SET MODES
•
Set F Group (FO2 items):
• FO2 GAS1 (Air, 21 to 50%)
• FO2 GAS2 (Air, 21 to 100%)
• FO2 GAS3 (Air, 21 to 100%)
• FO2 Default (On/Off)
•
Set A Group (Alarms):
• Audible Alarm / LED Warning (On/Off)
• Max Depth Alarm (30 to 330 FT /10 to 100 M)
• Elapsed Dive Time Alarm (:10 to 3:00 hr:min)
• Max TLBG Alarm (1 to 7 segments)
• Dive Time Remaining Alarm (:00 to :20 min)
• Turn Press Alarm (Off, 1000 to 3000 PSI / 70 to 205 BAR)
• End Press Alarm (300 to 1500 PSI / 20 to 105 BAR)
• Max PO2 Alarm (1.20 to 1.60 ATA)
> On
> 330 FT
> 3:00 (hr:min)
> 5 segments (Deco)
> :20 (min)
> Off
> 300 PSI
> 1.60 (ATA)
•
Set U Group (Utilities):
• Wet Activation (On/Off)
• Units of Measure (Imperial / Metric)
• Safety Stop Time, Depth (Off/3/5 minutes, 10/15/20 FT, 3/4/5/6 M)
• Conservative Factor (On/Off)
• Backlight Duration (0/5/10 seconds)
• Sampling Rate (2/15/30/60 seconds)
• Transmitter 1 Link Code (Off/On, 000000 to 999999)
• Transmitter 2-3 Use (Self/Bud)
• Transmitter 2 Link Code (Off/On, 000000 to 999999)
• Transmitter 3 Link Code (Off/On, 000000 to 999999)
> On
> Imperial
> 3:00 (min:sec)
> Off
> :05 (sec)
> 15 (sec)
> serial no.
> Self
> serial no.
> serial no.
>
Factory Settings:
> Air
> Air
> Air
> On
153
SPECIFICATIONS (CONTINUED)
NORM/GAUG SET MODES (continued)
•
Set T Group (Time/Date):
• Hour Format (12/24)
• Time (hour:min)
• Date (year/month/day)
Factory Settings:
> 12
> actual at factory
> 0101 2006
•
VT3 Serial Number
• Factory set
> actual
NORM No Decompression Dive Displays:
• Main (default) - TLBG, O2BG, VARI, ATR, Pressure, Elapsed Dive Time, Dive Time Remaining, Current Depth
• Alternate #1 - Day of Week, Temperature, Time of Day (hr:min)
• Alternate #2 - TLBG, O2BG, VARI, ATR, TMT #, Pressure, Elapsed Dive Time, Air Time Remaining, Max Depth
• Alternate #3 - TLBG, O2BG, VARI, GAS #, Current PO2, FO2 Set Point, Current Depth
• Safety Stop - TLBG, O2BG, VARI, ATR, Pressure, Stop Depth, Stop Time, Dive Time Remaining, Current Depth
NORM Decompression Dive Displays:
• Main (default) - TLBG, O2BG, VARI, ATR, Stop Depth, Pressure, Stop Time, Total Ascent Time, Current Depth
• Alternate #1 - Day of Week, Temperature, Time of Day (hr:min)
• Alternate #2 - TLBG, O2BG, VARI, ATR, TMT #, Pressure, Elapsed Dive Time, Air Time Remaining, Max Depth
• Alternate #3 - TLBG, O2BG, VARI, GAS #, Current PO2, FO2 Set Point, Current Depth
NORM Violation Modes (displays similar to Deco) - Conditional, Delayed, and Immediate/Violation Gauge
NORM High PO2 (1.20 to 1.60 ATA)
NORM High Oxygen Accumulation (300 OTU per dive / 24 hr)
NORM Gas Switch Preview (TMT 2-3 Use set for Self) - TLBG, O2BG, Gas #, FO2 Set, Current Depth
NORM Buddy Tank Pressure Check (TMT 2-3 Use set for Bud) - BUD #, Pressure
154
SPECIFICATIONS (CONTINUED)
GAUG Dive Displays:
• Main (default) - graphic GAUG, VARI, Pressure, Elapsed Dive Time, Current Depth
• Alternate 1 - Day of Week, Temperature, Time of Day (hr:min)
• Alternate 2 - TMT #, VARI, Pressure, Elapsed Dive Time, Air Time Remaining, Max Depth
FREE Dive Displays:
• Main (default) - graphic FREE, Temperature, Elapsed Dive Time (min:sec), NDC Time (hr:min), Current Depth
• Alternate 1 - Day of Week, Temperature, Time of Day (hr:min)
• CDT Status - graphic TIMR (Timer), Timer Setting (On/Off), Countdown Time Remaining (min:sec)
NUMERIC DISPLAYS:
• NORM/GAUG Dive Number
• FREE Dive Number
• Current Depth
• Maximum Depth
• Gas 1 FO2 Set Point
• Gas 2 FO2 Set Point
• Gas 2 FO2 Set Point
• PO2 Value
• Dive Time Remaining
• Air Time Remaining
• Total Ascent Time
• No Deco Safety Stop Time
• Decompression Stop Time
• NORM/GAUG Elapsed Dive Time
• FREE Elapsed Dive Time
• Surface Interval Time
• FREE Surface Interval Time
•
•
Dive Log Surface Interval
Time to Fly
Range:
0 to 24
0 to 99
0 to 330/399 FT (100/120 M)
330/399 FT (100/120 M)
Air, 21 to 50 %
Air, 21 to 100 %
Air, 21 to 100 %
0.00 to 5.00 ATA
0:00 to 9:59 hr:min
0:00 to 9:59 hr:min
0:00 to 9:59 hr:min
5:00 to 0:00 min:sec
0:00 to 9:59 hr:min
0:00 to 9:59 hr:min
0:00 to 59:59 min:sec
0:00 to 23:59 hr:min
0:00 to 59:59 min:sec
1:00 to 23:59 hr:min
0:00 to 23:59 hr:min
23:50 to 0:00 hr:min*
(* starting 10 min after the dive)
Resolution:
1
1
1 FT (.1 M )
1 FT (.1 M)
1%
1%
1%
.01 ATA
1 minute
1 minute
1 minute
1 second
1 minute
1 minute
1 second
1 minute
1 second
1 minute
1 minute
1 minute
155
SPECIFICATIONS (CONTINUED)
NUMERIC DISPLAYS (cont'd):
• Time to Desaturate
•
•
•
•
Temperature
Tank Pressure
Time of Day
FREE Countdown Timer
•
•
Out of Range (- - -)
Violation Countdown Timer
Range:
23:50 max to 0:00 hr:min*
(* starting 10 min. after the dive)
0 to 140°F (-9 to 60°C)
0 to 5000 PSI (345 BAR)
0:00:00 to 23:59:59 hr:min
59:59 to 0:00 min:sec
Resolution:
1 minute
1°
5 PSI (1 BAR)
1 minute
1 second
=> 330/399 FT (100/120 M)
23:50 to 0:00 hr:min (after violation)
BAR GRAPHS
Tissue Loading Bar Graph:
• No Decompression zone
• Decompression zone
segments
1 to 7
8 (all)
Oxygen (O2) Bar Graph:
• Normal zone
• Danger zone
segments
1 to 4
5 (all)
Variable Ascent Rate Indicator:
Deeper than 60 FT (18 M)
Segments Ascent Rate =
Displayed
FPM
MPM
0
0-20
0-6
1
21-30
6.1-9
2
31-40
9.1-12
3
41-50
12.1-15
4
51-60
15.1-18
5
60 +
18 +
156
60 FT (18 M) & Shallower
Segments Ascent Rate =
Displayed
FPM
MPM
0
0-10
0-3
1
11-15
3.1-4.5
2
16-20
4.6-6
3
21-25
6.1-7.5
4
26-30
7.6-9
5
30 +
9+
SPECIFICATIONS (CONTINUED)
OPERATIONAL PERFORMANCE
Function:
• Depth
• Timers
Accuracy:
±1% of full scale
1 second per day
Dive Counter:
• NORM/GAUG displays Dives #1 to 24, FREE displays Dives #1 to 99 0 if no dive made yet
• Resets to Dive #1, upon diving (after 24 hours with no dives)
NORM/GAUG Dive Log Mode:
• Stores 24 most recent NORM/GAUG dives in memory for viewing
• After 24 dives, adds 25th dive in memory and deletes the older dive
Altitude:
• Operational from sea level to 14,000 feet (4,270 meters) elevation
• Measures ambient pressure every 30 minutes when not activated, upon activation by push button, and every 15
minutes while in NORM/GAUG/FREE Surface Modes.
• Does not measure ambient pressure when Wet.
• Compensates for Altitudes above sea level beginning at 3,001 feet (915 meters) elevation and every 1,000 feet
(305 meters) higher.
Conservative Factor:
• Reduces NORM and FREE NDLs to those for the Altitude 3,000 feet (915 meters) higher.
Power:
• VT3 Battery
• Transmitter Battery
• Shelf life
• Replacement
• Use Life (VT3)
• Use Life (Transmitter)
1 - 3 vdc, CR2450, Lithium battery
1 - 3 vdc, CR2, .75 Ahr, Lithium battery (Duracell model DL-CR2 or equivalent)
Up to 5 years
User replaceable (annual recommended)
1 year or 300 dive hours if 2 - 1 hour dives per dive day
300 dive hours if 2 - 1 hour dives per dive day
157
SPECIFICATIONS (CONTINUED)
OPERATIONAL PERFORMANCE (continued) Battery Indicator:
• Warning - icon on solid at 2.75 volts, VT3 Battery change recommended
• Alarm - icon on flashing at 2.50 volts, change the VT3 Battery
Activation:
• Manual - push button (recommended), required if Wet Activation is set OFF.
• Automatic - by immersion in water (if set ON)
• Graphic WET indicates Activation Contacts are Wet (unit must be dried prior to transport or storage)
• Cannot be manually activated deeper than 4 FT (1.2 M), if Water Activation is set OFF.
• Cannot operate at elevations higher than 14,000 feet (4,270 meters)
Operating Temperature:
• Out of the water - between 20 °F and 140 °F (-6 and 60 °C).
• In the water - between 28 °F and 95 °F (-2 and 35 °C).
• At extremely low temperatures, the LCD may become sluggish, but this will not affect it's accuracy. If stored or
transported in extremely low temperature areas (below freezing), you should warm the unit and its battery with
body heat before diving.
Storage Temperature:
• Out of the water - between 14 °F and 158 °F (-8 and 70 °C).
158
ADDITIONAL INFORMATION PERTAINING TO FREE DIVE MODE
Although breathing apparatus is not utilized for FREE Dive activities, nitrogen tissue loading remains a
factor. Nitrogen loading is calculated based upon a fixed FO2 of AIR. Since a user has the option of
alternating between NORM (SCUBA) and FREE Dive activities within a 24 hour period, nitrogen
calculations and the displayed value of No Deco Dive Time Remaining (NDC Time) are carried over
from one operating mode to the other, which permits the user to maintain awareness of nitrogen
absorption and offgasing status.
The mathematical model currently used in the VT3 is based on no decompression/decompression
multilevel repetitive dive schedules. This algorithm does not take into account the physiological
changes associated with the high pressures that competitive type Free diving can expose a diver to.
WARNINGS:

Ensure that you know which Operating Mode is selected (NORM, GAUG, or
FREE) prior to commencing any dive.

Conducting Free dives within a 24 hour period after conducting SCUBA dives,
combined with the effects of multiple rapid Free Dive ascents, increases your risk
of decompression sickness. Such activities may result in accelerated entry into
decompression which could cause serious injury or death.

Combining competitive type Free dive activities that involve multiple descents/
ascents with activities utilizing SCUBA during the same 24 hour period is not
recommended. Presently, there is no data relating to such activities.

It is highly recommended that anyone planning to become involved in
competitive type Free dive activities obtain proper instruction and training from
a recognized Free Diving trainer.
It is imperative that the physiological affects
be understood and the diver is physically prepared.
159
INSPECTION / SERVICE RECORD
VT3 Serial Number: _________________________________
Transmitter #1 Serial Number: _________________________________
Transmitter #2 Serial Number: _________________________________
Transmitter #3 Serial Number: _________________________________
Date of Purchase: ____________
Purchased from: __________________________
Below to be filled in by an Authorized Oceanic Dealer:
Date
160
Service Performed
Dealer / Technician
f
e
r
q
f
p
s
t
o
c
n
m
g
l
k
a
d
b
h
Components:
a. Mode/Mix (M) Button
b. Advance (A) Button
c. Select (S) Button
d. LED Warning Light
e. TLBG
f. VARI
g. O2BG
h. Symbol - FT or M (Depth)
i. Symbol - MAX
j. Symbol - NITROX
k. Icons - Tank (Gas) 1, 2, 3
l. Symbol - FO2
m. Air Time Remaining
n. Symbols - AIR TIME
TIME NDC
TIME O2
TIME TAT
TIME SURF
o. Icon - Ascend Arrow
p. Symbol - PSI or BAR (Pressure)
q. Icon - Low Battery
r. Icon - degrees (Temperature)
s. Symbol - STOP TIME
DIVE TIME
t. Icon - Descend Arrow
i
j
VT3 FULL LCD
161
OCEANIC WORLD WIDE
OCEANIC USA
2002 Davis Street
San Leandro, CA 94577
Tel: 510/562-0500
Fax: 510/569-5404
Web: www.OceanicWorldwide.com
E-mail: hello@oceanicusa.com
OCEANIC NORTHERN EUROPE
Wendelstein, Germany
Tel: +49 (0) 9129 90 99 780 Fax: +49 (0) 9129 90 99 789
Web: www.Oceanic.de
E-mail: hello@oceanic.de
OCEANIC AUSTRALIA
Sorrento, Victoria, Australia
Tel: 61 3 5984 4770 Fax: 61 3 5984 4307
Web: www.OceanicAus.com.au
E-mail: hello@oceanicaus.com.au
OCEANIC SOUTHERN EUROPE
Genova, Italy
Tel: +39 010 8382006 Fax: +39 010 8365360
E-mail: hello@oceanicse.it
OCEANIC ASIA - PACIFIC
Singapore
Tel: +65 6391 1420 Fax: +65 6297 5424
Web: www.Oceanicasia.com.sg
E-mail: hello@OceanicAsia.com.sg
OCEANIC UNITED KINGDOM
Devon, United Kingdom
Tel: (44) 1404 891819 Fax: +44 (0) 1404 891909
Web: www.OceanicUK.com
E-mail: hello@oceanicuk.com
OCEANIC FRANCE
Marseille, France
Tel: 0033.491.25.37.78 Fax: 0033.491.72.34.48
E-mail: oceanicfrance@wanadoo.fr
162
OCEANIC JAPAN
Yokohama Kanagawa-Prev, Japan
Tel: 03-5651-9371
Web: www.Oceanic-jp.com
E-mail: hello@oceanic-jp.com
OCEANIC HAWAII (Pacific)
Kapolei, Hawaii
Tel: 808-682-5488 Fax: 808-682-1068
E-mail: oceanicint@aol.com
OCEANIC® USA
2002 Davis Street
San Leandro, CA 94577
Tel: 510-562-0500
Fax: 510-569-5404
http://www.OceanicWorldwide.com
©2002 Design, 2006
Doc. No. 12-2705-r03 (11/1/07)
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