GPS Training

GPS Training
NORTHEAST COASTAL AND BARRIER NETWORK
INVENTORY AND MONITORING PROGRAM
Standard Operating Procedure
Using the Garmin V GPS Unit
Version1: August 2004
DRAFT
Developed by:
Dennis E. Skidds
NCBN GIS Specialist
University of Rhode Island
NCBN Information Management Plan Appendix
Northeast Coastal and Barrier Network
Standard Operating Procedure (SOP)
for the Garmin V GPS Unit
Version 1.0 (August 2004)
Developed by: Dennis Skidds, University of Rhode Island
Revision History Log:
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This Standard Operating Procedure explains the procedures that all observers should
follow to set up and use the Garmin V GPS unit with differential correction beacon
receiver to collect data and navigate to survey locations.
Key Concept: PDOP (proportional dilution of precision), a measure of GPS accuracy.
Download almanacs for the day on which fieldwork will be conducted from a base
station near the park you will be visiting. Then use Trimble’s free planning software to
identify times of high PDOP. GPS data should be collected when the PDOP is low,
ideally below 6. High PDOP typically reflects a combination of poor satellite
geometry and unfavorable atmospheric conditions.
Using the Garmin V GPS Unit
References
1. Garmin V Personal Navigator User’s Manual and Reference Guide
2. Garmin MapSource User’s Manual and Reference Guide
3. MBX-3S Differential Beacon Receiver Manual
4. Backpack Assembly Instructions for Garmin V System (3-D Marketing, LLC):
Appendix A
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I. SCHEDULING FIELD DAYS
In order for your GPS unit to collect accurate geographic locations, it is preferable to
schedule field data collection for times when there are at least 4 satellites overhead and
the estimated PDOP (the measurement of relative accuracy) will be less than 6. In
order to facilitate data collection mission planning, almanac files (sets of data that are
used to predict satellite orbits over approximately a one month period) are available
from GPS base stations throughout the world. The almanac files can then be read using
free planning software available from Trimble .
1.)
Downloading the Current Almanac and Planning Software
a) Download a free copy of Trimble Planning Software  from
http://www.trimble.com/planningsoftware.html, and follow the setup
instructions.
b) Identify a GPS base station nearby to the area where data collection will take
place. In southern New England, the University of Rhode Island hosts a station
at http://www.edc.uri.edu/gps/. Stations for other areas can be found at
http://www.fs.fed.us/database/gps/clickmap/cbsmap.htm.
c) Make a note of the base station’s latitude, longitude, and elevation.
d) Download the almanac that covers the time and date when data collection will
take place.
2.)
Accessing the Almanac
a) Open the Trimble Planning Software . Under File -> Station, enter your base
station information and click OK.
b) To import the almanac, select Almanac -> Import -> .SSF (or other appropriate
file format).
c) For a graph of satellite availability throughout the day, choose Graphs ->
Number of Satellites. GPS readings may be rejected when there are less than 4
satellites available.
d) For a graph of PDOP estimates throughout the day, choose Graphs -> DOP ->
Positional. A PDOP above 6 is generally considered too high.
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II. PRE-TRIP PLANNING
1.)
Plan your route. Planning your route can maximize your time by allowing you
to collect information on several features on the same trip. In addition, the
topography of the area where you are collecting data may require changes in the
Garmin V’s elevation configuration.
2.)
Check battery levels. At least 8 hours before anticipated use, check to ensure
that batteries have been fully charged. This can be done by observing the
battery icon on the Main Menu screen of the Garmin V (accessed by pressing
the Menu button twice).
[Note: using 3-D’s AC/DC Adapter (output 12VDC @ 500mA), it will require 8
full hours to completely recharge a drained battery. It will require 4 hours to
completely recharge a 50% drained battery and so on.]
3.)
Suggested field materials and equipment.
1. notebook and pencil
2. GPS unit
3. GPS field guide (this document)
4. extra batteries
5. watch
6. water
7. compass
8. radio or cell phone
9. bug repellent
10. field guides as needed
III. SYSTEM ASSEMBLY
For complete instructions on assembling the NPS backpack unit with Garmin V
receiver and differential correction beacon, see APPENDIX A.
Garmin V / Beacon Unit Setup
1. Each GPS unit is stored in its own NPS backpack. Even though parts are
interchangeable, the units should be stored as complete sets.
2. At least 8 hours before anticipated use, check to ensure that batteries have been
fully charged. Using 3-D’s AC/DC Adapter (output 12VDC @ 500mA), it will
require 8 full hours to completely recharge a drained battery. It will require 4 hours
to completely recharge a 50% drained battery and so on.
3. Place one of the small, black, Velcro™ battery holders (unfolded) on a flat surface
with the center felt surface facing down and the small tail strap pointing towards
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you. Lay the external battery (Multiplier label face down and CLP plug on the top
left) in the center of the holder, flush with the bottom. Fold small tail strap up over
the battery so that it now points away from you. Fold the right-hand side of the
pocket over and then the left-hand side so that all attach snugly together, and then
attach this inside the backpack, near the bottom.
4. The MBX-3S beacon receiver has no ON/OFF switch. It is turned “ON” or “OFF”
by connecting or disconnecting it from the power supply. At this time, turn the
MBX-3S “ON” by plugging the black, male, cigarette lighter adapter plug on the
RED Quadcom cable, into the female cigarette lighter socket from the battery. The
MBX-3S receiver display will come on and begin its startup sequence. Once the
MBX-3S is powered, it will begin searching for the strongest differential signal
available. To maximize DGPS positional accuracy and repeatability, it is
recommended that you manually tune the beacon receiver to the closest differential
transmitting station, instead of allowing it to run in automatic search mode. This is
best-done using the Garmin GPS receiver.
5. Turn on the Garmin GPS by holding the Power key down for 2 seconds. Enter out
of warnings / intros. Press the MENU key twice, scroll down to the SETUP
selection and press ENTER. Scroll to the last sub-menu, which is the INTERFACE
menu. This is where you set up the Garmin GPS for differential operation.
6. Scroll down to the Format field and press “ENTER.” Scroll down to “RTCM
In/NMEA Out”, and press “ENTER” Once this selection is made, the Baud Rate,
Beacon, Freq., and Bit Rate fields will appear. See APPENDIX B for help in
choosing settings from an appropriate differential correction beacon. This
information can also be found by accessing the United States Coast Guard web site
at: www.navcen.uscg.gov/ADO/DgpsSelectStatus.asp or accessing the CSI
Wireless web site at: www.csiwireless.ca/support/pdfs/radiolistings.pdf.
[If you do not have web access and know the name of the closest beacon station, but
do not know the frequency, you can use the Beacon Table in the MBX-3S. On the
MBX-3S receiver you have three functional buttons, an UP arrow, a DOWN arrow
and an ENTER button. In order to select an option on the receiver, the desired
selection must be on the top line of the two line display, and then the ENTER button
must be pressed to select the option. If an undesired selection is made, then scroll
up or down to the “BACK” selection, and press “ENTER” This will return you to
the previous menu level. Once the MBX-3S has finished its start-up sequence, you
will see “Stn XXX.0 BX00” Press ENTER. Scroll down so that "Select Beacon" is
on the top line of the display. Press ENTER and scroll down until "North America"
is on the top line. Press ENTER. Scroll down until "U.S.A." is on the top line. Press
ENTER. Scroll up or down until you find the name of the beacon that is closest to
your location and press ENTER to select it. The receiver will say "Sending
Command...." and will try to lock on to the station. The correct frequency and bit
rate will be displayed for a few seconds while it tries to tune. Make note of these
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numbers and then re-tune to that frequency using the Garmin GPS as per Step 6
above.]
7. The word “Receiving“ will be displayed in the “Status” field. Once lock is achieved
on the MBX-3S, the SNR value will appear in the “SNR” field. At the same time
the word “Differential” will also appear on the satellite page to confirm that you
have a “Differential GPS” position. Push the QUIT button and return to the set of
main pages. Press the PAGE button until you see the signal strength bar and sky
view page. The signal strength bars should have a small “D” in the bottom of them
if the GPS receiver is receiving a valid differential signal. Your position will also be
displayed as a “3D Differential” position.
Note: The Signal to Noise Ratio (SNR) value must be higher than 6 for the receiver
to lock. When it locks on to a station, the lock symbol in the top right corner of the
display of the MBX-3S will close. If it does not immediately lock on to the station,
there can be several reasons; if you are inside, the type of building material can
prevent lock, if you are outside, power lines or other sources of RF interference can
be present. If you are in a vehicle, try to locate the MGL-3 antenna away from the
engine. Moving the antenna just a few inches can make a difference. If after being
in differential mode, the MBX-3S loses lock status, the Garmin GPS will continue
to operate in “Differential” mode for 30 seconds, after which time an error message
will appear, letting the user know that differential is no longer available.
8. Enable WAAS—When the dGPS beacon signal becomes unavailable when
navigating in the field, WAAS (Wide Area Augmentation System) capability
improves the positional accuracy of the GPS unit by searching for a WAAS satellite
near your location and receiving differential correction data. When WAAS is
enabled, you will see WAAS satellite numbers of 33 or above displayed on the
Satellite Status Page, and a “D” will appear above the signal bars for all satellites
from which differential data has been received.
At the Setup page off of the Main Menu, scroll to the System tab and highlight the
WAAS field. Press the Enter key and choose ‘Enabled.’
IV.
FILE UPLOAD FROM PC TO GPS UNIT USING MAPSOURCE 
Waypoints, detailed street maps, and other spatial data can be uploaded to the Garmin
V to aid in navigation using the accompanying MapSource  software.
1.) Connecting the GPS Unit to the Computer:
a.) Connect the gray Data/Power Cable (Garmin 4-pin connector) from the backpack
setup to the GPS Unit.
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b.) Connect the dark blue PC interface cable (9-pin connector) from the backpack
to a Serial Communications Port on the computer.
c.) Turn the GPS unit on by pressing the power button for two seconds. Press the
Menu button twice to access the Main Menu. Select the Setup page and scroll
to the Interface tab. Make sure that the Serial Data Format is set to ‘Garmin.’
d.) In MapSource, select Preferences from the Edit Menu and click the Transfer
tab. Click the Auto Detect button and make sure the software has detected the
correct port and Garmin unit.
2.) Uploading Data to the GPS Unit:
a.) In MapSource, select ‘Save to Device’ from the File menu.
b.) Choose the formats of the files to upload, and click Save.
V. DATA CAPTURE
1.) Saving Waypoint Locations— The Garmin V can hold up to 500 Waypoints.
a) Press and hold the Enter key. The ‘Mark Waypoint’ page appears, with a
default 3-digit name for the point. The location is captured by the unit
immediately, so there is no need to remain still while subsequently editing the
waypoint name, etc.
b) If you wish to rename the waypoint, select the name field, and press Enter. Use
the Rocker Keypad and Enter to select new text, and select “OK” when done.
c) If you wish to change the Waypoint symbol, select the symbol field to the left of
the Waypoint name and press Enter. Use the Rocker Keypad and Enter to a
select new symbol.
d) Once a final name and symbol have been chosen, select the ‘OK’ button to
permanently save the waypoint.
2.) Average location Waypoint—This feature allows you to average position samples
over time and save the result as a waypoint. Averaging reduces the effects of
position errors and results in a more accurate position reading. To use the
averaging function, the Garmin V must be locked onto satellites and have a valid
position reading.
a) With the Map Page displayed, choose ‘Menu’, then ‘Average Locations’.
Observe the Accuracy and Measurement Count figures.
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b) When these figures reach the desired value(s), highlight Save and press ENTER.
c) The new waypoint appears with a default 3-digit name. Accept the default, or
change the name by highlighting the waypoint name field, pressing Enter, and
choosing a new name with the Rocker Keypad and Enter key. When finished,
highlight OK and press Enter. Then highlight OK on the New Waypoint
window and press Enter.
3.) Waypoint Notes—You may record up to 50 characters of additional text
information regarding a waypoint with the Waypoint Note feature. With the ‘Mark
Waypoint’ or ‘Waypoint’ page displayed, press the Menu button and select
‘Waypoint Note’. Select Edit to bring up the text selection display.
4.) Track logs—Up to 10 line or polygon features can be recorded in the Garmin V
using Track Logs. Because of limited memory for each feature, the percent of
allocated memory used should be regularly monitored on the Tracks Page off of the
Main Menu.
a) TRACK LOG RECORDING SETUP
i.)
At the Tracks page, press the Menu button and select ‘Setup Track
Log’.
ii.)
When 100% of the memory for a Track Log has been used, the unit
will continue saving data by rewriting over the oldest Track Log. To
have the unit stop recording when memory is full, check the ‘Wrap
When Full’ box.
iii.)
Highlight ‘Record Interval’, press Enter, and select the desired
interval.
iv.)
Highlight ‘Value’ or ‘Resolution’, press Enter, and select the desired
value or setting.
v.)
When finished, select ‘OK’ and press Enter.
b) SAVE CURRENT TRACK LOG—On the ‘Tracks’ page, select ‘Save’ and
press the Enter key.
c) DISPLAY ADDITIONAL INFORMATION—On the ‘Tracks’ page, select the
Track Log in the Saved Tracks window and press Enter.
d) DELETE TRACK LOGS— On the ‘Tracks’ page, select the Track Log in the
Saved Tracks window and press Enter. Select ‘Delete’ and Press Enter.
VI. FIELD NAVIGATION
The GPS unit can be used to navigate to known Waypoints and between known
Waypoints. Waypoints can be recorded using the GPS unit itself (see Section V), or by
using the MapSource  software on a PC.
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1.) Assigning Waypoint Locations—Waypoints can be assigned using the GPS unit
or MapSource  software.
a) To assign Waypoints in the field using the GPS unit, see Section V,1 above.
b) To create Waypoints using MapSource , select the Waypoint tool from the
Tools menu and click in the desired location on the map. MapSource  will
prompt for naming and other information. Upload waypoints to the GPS unit
using instructions in Section IV, above.
2.) Using the GPS Unit to Navigate in the Field
a) Press the Find button to display the Find Menu, and select Waypoints -> By
Name. Enter text to find the desired Waypoint. Highlight and press Enter.
b) To view the Waypoint on a map, highlight the Map button and press Enter.
c) To navigate to the Waypoint, highlight the GOTO button and press Enter. Use
the Rocker Keypad to select routing preferences.
d) To name and save the route that is being navigated, press the Page button until
the Current Route Page is displayed, press the Menu button, and select Save
Route.
VII. DOWNLOADING FILES FROM GPS UNIT TO THE PC
1.) Connect the GPS Unit to the Computer: See Section IV above.
2.) Downloading Data from the GPS Unit Using MapSource:
3.)
a.)
Open MapSource , select ‘Save to Device’ from the File menu.
b.)
Choose the formats of the files to upload (i.e., Waypoints, Tracks, etc.),
and click Open.
Downloading and Exporting Data from the GPS Unit Using DNRGarmin
a.)
Download and install a free copy of DNRGarmin from
http://www.dnr.state.mn.us/mis/gis/tools/arcview/extensions/DNRGarmin/DNR
Garmin.html
b.)
Open DNRGarmin. Select your desired projection information, if
prompted. (UTM in NAD 83 or WGS 84 are standard for many NPS
protocols.)
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c.)
Click the ‘Data Table’ button.
d.)
Choose ‘Download’ under the Waypoint or Track menu, as needed.
e.)
To export data in shapefile format, choose File -> Save To… -> File, and
save as either an unprojected shapefile (remains in lat/long) or projected
shapefile (data is transformed to your chosen projection/datum).
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APPENDIX A
BACKPACK ASSEMBLY INSTRUCTIONS FOR GARMIN V SYSTEM
1) Unpack the re-chargeable battery (P/N 1225-204), connect to the AC/DC adapter, and
begin charging the battery. Read the IMPORTANT BATTERY INFORMATION at
the end of this document.
2) Remove the GIS backpack from the plastic bag. Unzip the backpack and remove the
black Velcro™ pockets. Remove the multi-colored QuadCom Power/Data Cable, the
GRAY GPS Antenna Cable and the BLACK MGL-3 Antenna Cable from their bags.
3) Open the white box containing the MBX-3S differential beacon receiver, the MGL-3
combination GPS, WAAS, and Radio Beacon antenna, and the vehicle, magnetic,
antenna mount. At this time, remove the gray, plastic antenna adapter, from the
magnetic mount, and install it into the MGL-3 antenna. Be very careful not to cross
thread the antenna, while installing the adapter into the antenna. If you do happen to
cross thread the antenna, it is still possible to properly install the adapter; it just takes
more time and careful effort. Also, do not install the gray, plastic, antenna adapter onto
the backpack pole, before threading it into the MGL-3 antenna, as this also increases
the risk of cross threading. Then take the remaining magnetic mount base, and store it
in one of the pockets of the backpack. If necessary, record the serial numbers of the
MGL-3 and the MBX-3S.
4) Open the Garmin GPS receiver box and remove the Garmin GPS Map 76. Install 2, AA
batteries (not supplied in the kit) into the Garmin GPS for back-up power or
autonomous operation. If necessary, record the unit serial number.
5) Remove the large Velcro™ pocket from the backpack. Place the MBX-3S receiver into
the pocket with the receiver connectors on the same end as the two narrow straps and
the display on the same end as the wide strap. Place the pocket with the MBX-3S into
the pack. Placement near the top (for ease of viewing) and in the center (to distribute
the load) seems to work best. The face of the receiver should be pointed toward the top
of the bag with the top of the receiver toward the person wearing the pack. If you wish
to have easy access to the front panel display of the MBX-3S, then simply tuck the
wide Velcro™ strap into the pocket. The cables, which connect to the rear of the MBX3S, will prevent it from falling out of the pocket, under normal conditions during field
use. It is recommended that the large Velcro™ strap be attached over the top of the
pocket to securely hold the MBX-3S in place during field use.
6) Take the multicolored QuadCom cable, and place it in the backpack somewhere
underneath the MBX-3S. Without unwinding the entire cable, make the following
connections:
1. Attach the GREEN power cable, with the black, circular 2 pin ConXall power
connector, to the connector labeled “PWR”, on the MBX-3S
2. Attach the GREEN XBX data cable, with the GREEN male, DB-9 pin
connector, to the female 9 pin DB9 serial connector labeled “DATA” on the
MBX-3S
Then take the two RF cables and make the following connections:
3. the GRAY GPS antenna cable to the TNC connector labeled “GPS OUT”
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4. and the BLACK MGL-3 antenna cable to the BNC connector labeled “ANT
IN”
If necessary, refer to the Cabling Diagram attached to these instructions.
The BLACK antenna cable (TNC connector) should be fed out through the small hole
on the right topside of the bag and into the antenna sleeve, then out the top of the
antenna sleeve. The GRAY GPS antenna cable, (MCX connector) and the GRAY
Data/Power Cable (Garmin 4-pin connector) should be fed out through the small hole
in the bottom, right-hand side of the bag. You will need about two feet of length in both
the GRAY cables to comfortably reach around to the front of your body, and about a
foot of the BLACK antenna cable to reach the MGL-3 antenna. Coil the remaining
lengths of cables inside the backpack, and use twist ties to hold them neatly in place.
7) Slide the black antenna bar into the left-hand side pocket of the backpack (the side that
you put the MGL-3 antenna cable out of in step 5). Do not snag or kink the BLACK
antenna cable. Be sure to place the small Velcro™ strap through the slot in the bar,
about 12 inches from the top, so that the bar is held tightly in place. If the “L” at the top
of bar is pointing inward (toward centerline of pack), the antenna will be close to your
head and less likely to catch on bushes, limbs, etc. when walking in the woods.
8) Screw the MGL-3 antenna assembly, with the gray plastic adapter, onto the top of the
antenna bar. Again, make sure the adapter is threaded into the antenna before you
fasten it to the backpack pole. Wrap the antenna cable around the antenna bar a few
times so that it will be held closely to the bar, and therefore less likely to catch on
anything. Attach the BLACK antenna cable (TNC connector) to the MGL-3 antenna.
9) Attach both the GRAY right-angled MCX RF connector and the GRAY 4-pin data
power connector to the back of the GPS Receiver. The 4-pin data power connector is
“keyed”, so be careful to align it properly. Do not force it. Once you have connected
these cables, find some twist ties or tape to bundle them together, if you do not have a
piece of split tubing included. It is recommended that you obtain a piece of split tubing
to bundle the cables together.
10) Place one of the small, black, Velcro™ battery holders (unfolded) on a flat surface with
the center felt surface facing down and the small tail strap pointing towards you. Lay
the external battery (Multiplier label face down and CLP plug on the top left) in the
center of the holder, flush with the bottom. Fold small tail strap up over the battery so
that it now points away from you. Fold the right-hand side of the pocket over and then
the left-hand side so that all attach snugly together, and then attach this inside the
backpack, near the bottom.
11) The MBX-3S beacon receiver has no ON/OFF switch. It is turned “ON” or “OFF” by
connecting or disconnecting it from the power supply. At this time, turn the MBX-3S
“ON” by plugging the black, male, cigarette lighter adapter plug on the RED Quadcom
cable, into the female cigarette lighter socket from the battery. The MBX-3S receiver
display will come on and begin its startup sequence. Once the MBX-3S is powered, it
will begin searching for the strongest differential signal available. To maximize DGPS
positional accuracy and repeatability, it is recommended that you manually tune the
beacon receiver to the closest differential transmitting station, instead of allowing it to
run in automatic search mode. This is best-done using the Garmin GPS receiver.
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12) Now turn on the Garmin GPS by holding the Power key down for 2 seconds. Once the
receiver starts up, press the PAGE key twice. Unless you are already outside, or have a
clear view of the sky, no satellite bars will appear. Please note, that the first time you
power up the Garmin GPS receiver, with a clear view of the sky, it will take up to 15
minutes to get its first fix. After the first initialization, the time to first fix will be much
quicker.
13) Set up the Garmin GPS. Press the MENU key twice, scroll down to the SETUP
selection and press ENTER. There are a series of sub-menus, which you can now go
through and set up according to your preferences. When you get to the LOCATION
menu, select the hddd° mm’ ss.s location format. The last sub-menu is the
INTERFACE menu. This is where you set up the Garmin GPS for differential
operation.
14) Setting up the Garmin for differential operation (and tuning the MBX-3S). From the
INTERFACE menu, scroll down to “Serial Data Format” and press “ENTER” Scroll
down to “RTCM/NMEA”, and press “ENTER” Once this selection is made, the Baud,
Beacon, Freq., and Bit Rate fields will appear. Set up each one of these appropriately.
If you have done these correctly, the word “Receiving“ will be displayed in the
“Status” field. Once lock is achieved on the MBX-3S, the SNR value will appear in the
“SNR” field. At the same time the word “Differential” will also appear on the satellite
page to confirm that you have a “Differential GPS” position. Push the QUIT button and
return to the set of main pages. Press the PAGE button until you see the signal strength
bar and sky view page. The signal strength bars should have a small “D” in the bottom
of them if the GPS receiver is receiving a valid differential signal. Your position will
also be displayed as a “3D Differential” position.
15) If you do not know what frequency and bit rate to use, you will need to get this
information. This can be done by accessing the United States Coast Guard web site at:
www.navcen.uscg.gov/ADO/DgpsSelectStatus.asp or accessing the CSI Wireless web
site at: www.csiwireless.ca/support/pdfs/radiolistings.pdf. If you do not have web
access and know the name of the closest beacon station, but do not know the frequency,
you can use the Beacon Table in the MBX-3S. On the MBX-3S receiver you have three
functional buttons, an UP arrow, a DOWN arrow and an ENTER button. In order to
select an option on the receiver, the desired selection must be on the top line of the two
line display, and then the ENTER button must be pressed to select the option. If an
undesired selection is made, then scroll up or down to the “BACK” selection, and press
“ENTER” This will return you to the previous menu level. Once the MBX-3S has
finished its start-up sequence, you will see “Stn XXX.0 BX00” Press ENTER. Scroll
down so that "Select Beacon" is on the top line of the display. Press ENTER and scroll
down until "North America" is on the top line. Press ENTER. Scroll down until
"U.S.A." is on the top line. Press ENTER. Scroll up or down until you find the name of
the beacon that is closest to your location and press ENTER to select it. The receiver
will say "Sending Command...." and will try to lock on to the station. The correct
frequency and bit rate will be displayed for a few seconds while it tries to tune. Make
note of these numbers and then re-tune to that frequency using the Garmin GPS as per
Step 14 above.
Note: The Signal to Noise Ratio (SNR) value must be higher than 6 for the receiver to lock.
When it locks on to a station, the lock symbol in the top right corner of the display of the MBX3S will close. If it does not immediately lock on to the station, there can be several reasons; if
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you are inside, the type of building material can prevent lock, if you are outside, power lines or
other sources of RF interference can be present. If you are in a vehicle, try to locate the MGL-3
antenna away from the engine. Moving the antenna just a few inches can make a difference. If
after being in differential mode, the MBX-3S loses lock status, the Garmin GPS will continue
to operate in “Differential” mode for 30 seconds, after which time an error message will appear,
letting the user know that differential is no longer available.
**IMPORTANT BATTERY INFORMATION**
**PLEASE READ UPON RECEIPT OF SYSTEM**
M5010 Rechargeable Battery Information
1)
2)
3)
4)
5)
All batteries will ship from 3-D Marketing pre-charged 80-90%
Battery must be recharged at least once every 6 months when not in use and must be
stored at ambient temperature (25 °C)
100% drainage per usage will yield approximately 200 recharging cycles; 50%
drainage per usage will yield approximately 400 recharging cycles; 30% drainage
per usage will yield approximately 1000 recharging cycles.
Using 3-D’s AC/DC Adapter (output 12VDC @ 500mA), it will require 8 full hours
to completely recharge a drained battery. It will require 4 hours to completely
recharge a 50% drained battery and so on.
When charging is complete, disconnect the charger from both the battery and the
AC power. Leaving the battery attached to the charger after charging is complete,
must result in a minor battery drain.
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APPENDIX B
Beacon Interface Setup
Setup - Interface - Serial Data Format - "RTCM in/ NMEA out" (Note: if you want to
connect the GPS to a computer you will have to change this to “GARMIN” but don’t
forget to change it back when using the dGPS.)
- Baud - "4800"
- Frequency - "306.0" (Acushnet) ---- enter your closest beacon
- frequency here
- Bit Rate - "200" (for Acushnet 's) ----- enter the value that your beacon is set
at
- Status - should say "receiving"; otherwise "no signal"; "check wiring" means the
battery is dead or not hooked up correctly
- SNR - signal to noise ratio - the higher the #, the better; choose the closest
beacon that has the highest SNR
FUSES: if the unit shuts down for no apparent reason, check the fuses on the cigarette
lighter connectors. Replace blown fuses with 3A/250v fuses from radio shack.
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