Owner`s manual | Garmin 188C GPS Receiver User Manual

GPSMAP 188/188C Sounder
®
chartplotting receiver
owner’s manual
(GPSMAP 188C shown)
© Copyright 2005 Garmin Ltd. or its subsidiaries
Garmin International, Inc.
1200 East 151st Street,
Olathe, Kansas 66062, U.S.A.
Tel. 913/397.8200 or 800/800.1020
Fax 913/397.8282
Garmin (Europe) Ltd.
Unit 5, The Quadrangle,
Abbey Park Industrial Estate,
Romsey, SO51 9DL, U.K.
Tel. 44/0870.8501241
Fax 44/0870.8501251
Garmin Corporation
No. 68, Jangshu 2nd Road, Shijr,
Taipei County, Taiwan
Tel. 886/2.2642.9199
Fax 886/2.2642.9099
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onto a hard drive or other electronic storage medium to be viewed and to print one copy of this manual or of any revision hereto, provided that such electronic
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Information in this document is subject to change without notice. Garmin reserves the right to change or improve its products and to make changes in the content
without obligation to notify any person or organization of such changes or improvements. Visit the Garmin Web site (www.garmin.com) for current updates and
supplemental information concerning the use and operation of this and other Garmin products.
Garmin®, GPSMAP®, AutoLocate®, See-Thru®, TracBack®, BlueChart®, and MapSource® are registered trademarks of Garmin Ltd. or its subsidiaries and may not
be used without the express permission of Garmin.
May 2005
Part Number 190-00585-00 Rev. A
Printed in Taiwan
INTRODUCTION > ABOUT THIS MANUAL
INTRODUCTION
Thank you for choosing the Garmin® GPSMAP® 188/188C
Sounder. Take a moment now to compare the contents of this
package with the packing list on the outside of the box. If any
pieces are missing, contact your Garmin dealer immediately.
Before you begin working with the GPSMAP 188/188C Sounder,
review the installation instructions listed in the Appendix. If
you have any question about installing your chartplotter, contact
Garmin Product Support or a professional installer.
The GPSMAP 188/188C Sounder Quick Reference Guide contains
helpful tips on using the unit and performing various navigation
tasks. It is a good idea to keep the Quick Reference Guide nearby
whenever you are operating your new GPSMAP 188/188C
Sounder.
About This Manual
To get the most out of your new navigation system, take time to
read this manual and learn the operating procedures for your unit in
detail. This manual is organized into the following sections.
The Basic Operation section provides you with detailed
information and step-by-step directions for features such as using
the Find Menu, navigating a route, and using waypoints.
The Main Pages section provides detailed explanations about
each page in the GPSMAP 188/188C Sounder and step-by-step
directions on using the pages.
The Main Menu section provides detailed explanations about the
Main Menu and how to use it to configure your unit.
The Using Sonar section contains information on the sonar
capablities.
The Appendix contains installation instructions, specifications,
optional accessories, and maintenance information. You can also
find warranty and FCC information in the Appendix. Read the
Safety Information to learn how to install and use your Garmin
GPSMAP 188/188C Sounder safely and responsibly.
An Index is provided at the end of the manual for reference.
The Introduction section contains the Table of Contents and
GPSMAP 188/188C Sounder care information.
GPSMAP 188/188C Sounder Owner’s Manual
i
INTRODUCTION > TABLE OF CONTENTS
Table of Contents
Introduction...........................................................................i
About This Manual ................................................................... i
Care Information..................................................................... iv
Basic Operation ...................................................................1
Initializing the Receiver .......................................................... 1
Simulator Mode ....................................................................... 3
Adjusting the Backlight .......................................................... 4
Interface Keys .......................................................................... 5
Entering Data and Selecting Options .................................... 6
Using the Map Pointer ............................................................ 7
Creating and Using Waypoints .............................................. 8
Man OverBoard (MOB) .......................................................... 10
Reviewing and Editing Waypoints ....................................... 11
Navigating to a Destination .................................................. 12
Using the Nav Key ....................................................................... 12
Selecting a Go To Graphically ...................................................... 13
TracBack Navigation (Navigating a Track) .................................. 14
Routes .................................................................................... 17
Find ........................................................................................ 19
Additional Information .......................................................... 21
DSC ......................................................................................... 22
Understanding Distress Calls........................................................ 22
Understanding Position Reports ................................................... 23
Receiving DSC Calls .................................................................... 23
ii
Navigating to a Position Report or Distress Call .......................... 25
Setting up DSC ............................................................................. 25
Main Pages .........................................................................26
Map Page................................................................................ 27
Using the Map Pointer .................................................................. 28
Selecting Map Ranges .................................................................. 29
Map Page Options ........................................................................ 30
Pointer Page .......................................................................... 33
Numbers Page ....................................................................... 34
Highway Page ........................................................................ 35
Active Route Page ................................................................. 37
Main Menu ..........................................................................39
GPS Tab .................................................................................. 39
Tide Tab .................................................................................. 43
Trip Tab ................................................................................... 46
Celes (Celestial) Tab ............................................................. 47
Points Tab .............................................................................. 48
User Waypoint List ....................................................................... 49
Proximity Waypoint List............................................................... 51
Routes Tab ............................................................................. 53
Route Review Page ....................................................................... 54
Route Review Menu Options ....................................................... 55
Track Tab ................................................................................ 59
DSC Tab .................................................................................. 61
Card Tab ................................................................................. 62
Time Tab ................................................................................. 62
GPSMAP 188/188C Sounder Owner’s Manual
INTRODUCTION > TABLE OF CONTENTS
Pages Tab ............................................................................... 63
Map Tab .................................................................................. 64
General Sub Tab ........................................................................... 64
Source Sub Tab ............................................................................ 64
Waypoints Sub Tab ....................................................................... 65
Points Sub Tab .............................................................................. 66
Navaids Sub Tab ........................................................................... 66
Nav Line Sub Tab ......................................................................... 67
Track Sub Tab ............................................................................... 67
Other Sub Tab ............................................................................... 67
Hiway (Highway) Tab ............................................................. 68
Temp (Temperature) Tab ....................................................... 68
Sonar Tab ............................................................................... 68
Systm (System) Tab .............................................................. 69
Units Tab ............................................................................... 70
Comm (Communications) Tab ............................................. 72
Alarm Tab ............................................................................... 76
Using Sonar .......................................................................78
Sonar Page............................................................................. 78
Using the Adjustment Menu ......................................................... 79
Sonar Page Options ...................................................................... 83
Sonar Tab Options ................................................................ 85
Understanding Sonar ............................................................ 89
Understanding the Sonar Display ................................................. 89
Transducer Coverage .................................................................... 90
GPSMAP 188/188C Sounder Owner’s Manual
Whiteline ...................................................................................... 91
Thermoclines ................................................................................ 91
Appendix ............................................................................92
Specifications ........................................................................ 92
Installing the GPSMAP 188/188C Sounder ......................... 93
Mounting the GPSMAP 188/188C Sounder ......................... 94
Installing the Transducer ...................................................... 96
Connecting the Power/Data Cable ....................................... 98
Interfacing .............................................................................. 99
Installing and Removing Data Cards ................................. 100
Satellite Information ............................................................ 101
What is WAAS?.................................................................... 102
What is Differential GPS (DGPS)? ..................................... 102
What is Maritime Mobile Service Identity (MMSI)? ........... 103
How are MMSI Assignments Obtained? ............................ 103
Navigation Terms ................................................................ 104
Messages ............................................................................. 106
LORAN TD System .............................................................. 108
Optional Accessories .......................................................... 110
Software License Agreement ..............................................111
Product Registration ............................................................111
Limited Warranty ................................................................. 112
FCC Compliance.................................................................. 113
Safety Information ............................................................... 114
Index .................................................................................115
iii
INTRODUCTION > CARE INFORMATION
Care Information
Cleaning the Unit
The GPSMAP 188/188C Sounder is constructed of high quality
materials and does not require user maintenance other than
cleaning. Clean the unit using a cloth dampened with a mild
detergent solution and then wipe dry. Avoid chemical cleaners and
solvents that can damage plastic components.
Storing the GPSMAP 188/188C Sounder
Immersing the Unit in Water
The GPSMAP 188/188C Sounder is waterproof to IEC Standard
60529 IPX7. It can withstand immersion in 1 meter of water for 30
minutes. Prolonged submersion can cause damage to the unit. After
submersion, be certain to wipe and air dry the unit before reuse.
To resolve problems that cannot be remedied using this manual,
contact Garmin Product Support in the U.S.A. at 800/800-1020 or
Garmin Europe at 44/0870-8501241.
Do not store the GPSMAP 188/188C Sounder where prolonged
exposure to temperature extremes can occur (such as in the trunk
of a car) as permanent damage can result. User information, such
as waypoints and routes are retained in the unit’s memory without
the need for external power. It is always a good practice to back up
important user data by manually recording it or downloading it to a
PC (transferring it to MapSource.)
iv
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > INITIALIZING THE RECEIVER
BASIC OPERATION
Initializing the Receiver
The first time you turn on the GPSMAP 188/188C Sounder, the
receiver must be given an opportunity to collect satellite data
and establish its present location. To ensure proper initialization,
the GPSMAP 188/188C Sounder is shipped from the factory in
AutoLocate Mode.
Before you initialize, make sure the GPSMAP 188/188C Sounder
unit and antenna are correctly installed on your vessel according to
the instructions in the Appendix. Install the antenna in a location
with a clear and unobstructed view of the sky.
A full-screen GPS Information Page appears after you press
ENTER to acknowledge the Warning Page. The page goes away
after the unit gets a position fix or you press either ENTER or
QUIT. The page can be disabled and enabled on the
Main Menu—Pages tab (see page 63).
To turn on the GPSMAP 188/188C Sounder:
1. Press and hold the POWER key until the power tone
sounds, and then release the POWER key. The Warning
Page appears while the unit conducts a self-test.
2. When the self-test is complete, press ENTER to agree and
acknowledge the warning.
The GPS Information Page appears as the receiver begins acquiring
satellites.
To turn off the GPSMAP 188/188C Sounder:
1. Press and hold the POWER key for approximately
2 seconds, until the screen is blank.
2. When the screen is blank, release the POWER key.
GPSMAP 188/188C Sounder Owner’s Manual
1
BASIC OPERATION > INITIALIZING THE RECEIVER
To graphically initialize the GPSMAP 188/188C Sounder:
1. Press MENU twice for the Main Menu. Press up or down
on the ROCKER until the GPS tab is highlighted, and then
press MENU once.
2. Using the ROCKER, highlight Initialize Position, and press
ENTER. The Initialize Position Page appears, prompting
you to select your approximate location with the map
pointer.
3. Use the ROCKER to move the map pointer to your
approximate location within 200 miles. If you have difficulty
identifying your location, press and release the IN key to
see the next lower map range.
4. After you determine your approximate location on the map,
press ENTER.
NOTE: This does not calibrate the unit in any way, but rather
helps to speed up the initial satellite acquisition. If the unit
displays “Ready 2D or 3D” during this process, it is not
necessary to initialize the unit.
2
The unit now begins searching for the appropriate satellites for
your region and should acquire a fix within a few minutes. When
viewing the GPS tab on the Main Menu, a signal strength bar for
each satellite in view appears on the bottom of the page, with the
appropriate satellite number under each bar.
• No signal strength bars—the receiver is looking for the
satellites indicated.
• Hollow signal strength bars—the receiver has found the
indicated satellite(s) and is collecting data.
• Solid signal strength bars—the receiver is ready to use.
When the receiver has collected information from at least three
satellites, the top of the screen displays either “Ready 2D or 3D”,
and the GPSMAP 188/188C Sounder is ready for use.
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > SIMULATOR MODE
Simulator Mode
Simulator Mode turns the GPS receiver off for use indoors or
practice. Any of the functions discussed in the following pages
can be performed in Simulator Mode. While in Simulator Mode, a
“Running Simulator” message appears after 2 minutes of inactivity.
Keep in mind that the GPSMAP 188/188C Sounder does not
track satellites in Simulator Mode, and this mode should never be
used for actual navigation. All the waypoint and route planning
completed in Simulator Mode is retained in memory for future use.
NOTE: Do not attempt to navigate using Simulator Mode.
When the unit is set to Simulator Mode, the GPS receiver is
turned off. Any satellite signal strength bars displayed are only
simulations and do not represent the strength of actual satellite
signals.
GPSMAP 188/188C Sounder Owner’s Manual
To place the GPSMAP 188/188C Sounder in
Simulator Mode:
1. Press MENU twice to display the Main Menu. Press up or
down on the ROCKER until the GPS tab is highlighted, and
press MENU once.
2. Use the ROCKER to highlight Start Simulator, and press
ENTER. Choose No to the retail demonstration, and press
ENTER.
3. Press ENTER to confirm the Running Simulator message
that appears at the bottom of the display. “Simulating”
appears at the top of each of the Main pages.
4. To turn off the Simulator Mode, press MENU and select
Stop Simulator.
3
BASIC OPERATION > ADJUSTING THE BACKLIGHT
To adjust the simulated speed and heading from the
Pointer or Highway Pages:
The Set Position,
Track Control, Track
and Speed fields
only show while in
Simulator Mode.
1. Press up on the ROCKER increase the speed in
10 knot/kph/mph increments. Press down on the ROCKER
to decrease the speed in the same increments.
2. Press left and right on the ROCKER to steer the boat.
Adjusting the Backlight
The Sounder’s adjustable screen backlighting is controlled with the
POWER key, and can be adjusted from any page.
To enter a simulated speed and heading from the
Main Menu:
1. Press MENU twice to display the Main Menu.
2. Use the ROCKER to highlight the Systm tab, press
right then down until the field below the word Speed is
highlighted, then press ENTER.
3. Use the ROCKER to enter a speed, and press ENTER.
4. Use the ROCKER to highlight Track Control. Press
ENTER, and select a heading.
5. Press ENTER to finish, and QUIT until you return to the
Map Page.
4
To adjust the backlight:
1. Press and release the POWER key. The adjustment slider
window appears.
2. Press the POWER key again to start the user-defined
backlight level. To adjust this level, press up or down on
the ROCKER. If you press POWER one more time, the
backlight is at the maximum setting.
3. Press ENTER or QUIT when finished.
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > INTERFACE KEYS
Interface Keys
NAV Key
• Press and release at any time to view the
Navigation menu.
QUIT Key
• Press and release to cancel data entry or
exit a page.
ROCKER Key
• Press up/down or right/left to move through
lists, highlight fields, on-screen buttons and
icons, enter data, or move the map pointer.
FIND Key
• Press to search for points such as user
waypoints, cities, and services.
POWER Key
• Press and hold to turn unit on or off.
• Press and release to adjust backlighting.
IN/OUT Zoom Keys
• From the Map Page, press to zoom in or out.
• From any other page, press to scroll up or
down a list.
PAGE Key
• Press to cycle through the Main pages.
• Press to end an operation in progress and
return to the main page.
MENU Key
• Press and release to view options for a page.
• Press twice to view the Main Menu.
ENTER/MARK Key
• Press and release to enter highlighted options
and data or confirm on-screen messages.
• Press and hold at any time to mark your
current location as a waypoint.
MOB Key
• Press and hold for MOB (Man OverBoard).
GPSMAP 188/188C Sounder Owner’s Manual
5
BASIC OPERATION > ENTERING DATA AND SELECTING OPTIONS
Entering Data and Selecting Options
You can select and start options, and enter data to customize the
GPSMAP 188/188C Sounder to fit your requirements. Use the
ENTER key and the ROCKER to select options, enter names and
numbers in data fields, and activate your selections.
Some pages contain on-screen buttons. As shown below, the New
Waypoint window has three buttons: Map, Delete, and OK. To
activate, highlight the a button, and press ENTER.
To select and start optional feature:
1. With any page displayed, press MENU to display the
options menu. The options menu displays a list of optional
features that are specific for that page. To select an option
requires movement of the pointer. This is referred to as
highlighting, selecting, or choosing an item.
2. Use the ROCKER to move the cursor (highlight) up and
down a list or up, down, left, and right on menus.
3. After you have highlighted a selection, press ENTER to
either activate the feature or press MENU to display a
sub-menu or list with more options. Repeat this process to
select an option from the list, or press QUIT to return to the
previous setting.
6
On-Screen Buttons
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > USING THE MAP POINTER
Using the Map Pointer
To pan the map:
Working from the Map Page centers around the use of the pointer.
Controlled by the ROCKER, the pointer is used to pan to map
locations, mark and edit waypoints and routes, and review position
data of on-screen map items and waypoints. When you move the
pointer over a map item, a highlighted description of that item
appears.
1. Use the IN/OUT keys to select a map range.
2. Use the ROCKER to move the pointer. A data field appears
at the top of the display showing the bearing and distance
from your boat to the pointer, along with the latitude/
longitude of the pointer.
3. Press QUIT to re-center your boat on the map display.
Distance
Bearing
Pointer
Coordinates
Current
Location
Map Pointer
Map Range
The map display actively scrolls or pans, enabling you to explore
areas around the world and create waypoints and routes. Pressing
QUIT returns the map to your present location.
NOTE: When the pointer reaches the edge of the map, the unit
can pause as it loads new map data.
GPSMAP 188/188C Sounder Owner’s Manual
7
BASIC OPERATION > CREATING AND USING WAYPOINTS
Creating and Using Waypoints
The Garmin GPSMAP 188/188C Sounder stores up to 3,000
alphanumeric waypoints with a user-defined symbol, comments,
and depth available for each waypoint. Waypoints can be created
using two basic methods:
ENTER/MARK Key—marks your present location, and provides
options to select a map location or map item from the map display.
Also, you can enter a new waypoint’s location coordinates
manually.
Graphically—defines a new waypoint location from the map
display using the ROCKER.
8
ENTER/MARK Key
The Garmin GPSMAP 188/188C Sounder’s ENTER/MARK key
quickly captures your present location to create a new waypoint.
The unit must have a valid position (2D or 3D) fix to mark your
present position. You can also use this option to manually enter
waypoint coordinates.
To mark your present position:
1. Press and hold ENTER/MARK until the New Waypoint
window appears. A default three-digit name and symbol is
created for the new waypoint.
2. To accept the waypoint with the default name and symbol,
highlight OK, and press ENTER.
3. To enter a different name, highlight the name field, and
press ENTER. Use the ROCKER to enter the new letter/
numbers, and press ENTER when finished. You can use up
to 10 characters for the name.
4. To select a different symbol, highlight the symbol field to the
left of the name, and press ENTER. Use the ROCKER to
highlight the new symbol, and press ENTER.
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > CREATING AND USING WAYPOINTS
5. To enter optional comments or a depth, highlight the
Comments or Depth field to the right of the location
coordinates, and press ENTER, use the ROCKER to enter
a value, and press ENTER.
6. To manually enter a set of coordinates, highlight the
coordinates, and press ENTER, use the ROCKER to enter
the new coordinates, and press ENTER when finished.
7. Use the ROCKER to highlight OK. When finished, press
ENTER to save the waypoint into memory.
Creating Waypoints Graphically
You create waypoints graphically from the map display. To mark
a map location or map item, select the location or item with the
pointer, and press ENTER/MARK. When selecting a location or
map item, a description of the point, its distance and bearing from
your current location, and the latitude/longitude of the pointer is
displayed along the top of the map.
GPSMAP 188/188C Sounder Owner’s Manual
To create a new waypoint graphically:
1. Use the ROCKER to move the pointer to a map location. If
you want to create the new waypoint at an on-screen map
item, highlight the map item on the display.
2. Press and release ENTER/MARK to capture the pointer
location. Do not hold the button down, doing so marks your
present location, not the map location.
If you are not using a map item to create a waypoint, go to
step 4.
3. Highlight Create Wpt or OK, and press ENTER.
4. To accept the waypoint with the default name and symbol,
press ENTER.
5. To change the name, symbol, or add a comment or depth,
highlight the appropriate field, and press ENTER. Make
your changes and press ENTER when finished.
6. Move the highlight back to OK, and press ENTER to confirm
the changes.
9
BASIC OPERATION > MAN OVERBOARD (MOB)
Man OverBoard (MOB)
The GPSMAP 188/188C Sounder’s Man OverBoard (MOB)
function simultaneously marks and sets a course back to the
marked location for quick response to emergency situations.
When a MOB is active, a MOB waypoint with an international
MOB symbol is created and the unit is on an active navigation to
that point. Use any of the Navigation Pages to guide you back to
the MOB point. The MOB waypoint is stored in the waypoint list
and works like any other waypoint.
The MOB function allows you to quickly activate
navigation back to a location.
To activate the MOB function:
1. Press the MOB key.
To stop navigation, highlight
Stop Navigation and press ENTER.
2. Press ENTER to begin navigating to the MOB location.
3. To stop navigation to the MOB location, press NAV,
highlight Stop Navigation, and press ENTER.
10
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > REVIEWING AND EDITING WAYPOINTS
Reviewing and Editing Waypoints
Waypoints are reviewed, modified, renamed, moved, or deleted at
any time through the Waypoint Edit Page. The Waypoint Edit Page
is available for any stored waypoint. Select the waypoint on the
map or from the waypoint list on the Main Menu—Points tab.
Sub Tabs
3. From the Waypoint Edit Page, change the name, symbol,
comment, location coordinates, or depth for the selected
waypoint. When finished, highlight Next, and press ENTER
to save them, or press QUIT.
Symbol
Name
Coordinates
Comment
Depth
Waypoint List
Waypoint Edit Page
To access the Waypoint Edit Page:
1. Use the ROCKER to highlight the waypoint on the map
display.
Or
Press MENU twice, highlight the Points tab, and choose a
waypoint from the User or Proximity waypoint lists.
2. Press ENTER to display the Waypoint Edit Page.
GPSMAP 188/188C Sounder Owner’s Manual
To change the waypoint name:
1. Highlight the waypoint name field, and press ENTER.
2. Use the ROCKER to enter a new name, and press ENTER.
11
BASIC OPERATION > NAVIGATING TO A DESTINATION
To change the waypoint symbol:
1. Highlight the waypoint symbol field to the left of the
waypoint name, and press ENTER.
2. Use the ROCKER to select a new symbol, and press
ENTER.
To change the Comment, Location, Coordinates,
or Depth:
1. Highlight a field, and press ENTER.
2. Use the ROCKER to edit or enter the data. To move to the
next line, press right on the ROCKER.
3. Press ENTER when finished.
To move the waypoint on the map:
Navigating to a Destination
Using the Nav Key
The NAV key provides three ways to navigate to a destination:
Go To Point, Follow Route, and Follow Track (TracBack). When
you are actively navigating, the Map Page displays a straight line
from your current location to the destination. The Go To option is
the easiest method for selecting a destination. A Go To allows you
to select a destination point and quickly set a direct course from
your present location. If you have a point highlighted on a list or
the map, Go To <point name> appears in addition to Go To Point.
The Go To function is accessed from any list of points or
graphically from the Map Page.
1. From the Waypoint Edit Page, highlight Show Map, and
press ENTER.
2. Highlight the waypoint, and press ENTER. A MOVE label
now appears under the pointer arrow in addition to a
distance, bearing, and coordinate window. You can also
use the IN and OUT keys to zoom the map. The map range
appears in the lower right corner.
3. Use the ROCKER to point to the new location, and press
ENTER.
4. To stop the move process, press QUIT.
12
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > NAVIGATING TO A DESTINATION
To activate a Go To from a point list:
1. Press the NAV key. Highlight Go To Point, and press
ENTER.
2. From the Find menu, highlight Waypoints or another menu
option, and press ENTER.
3. To select a waypoint from the waypoint lists, use the
ROCKER to highlight either the By Name or Nearest tab,
select a waypoint, and press ENTER.
Or
Select a waypoint from the map, highlight either the User or
Nearest tab, and press MENU.
With Select From Map highlighted, press ENTER. Use
the zoom IN and OUT keys and the ROCKER to select a
waypoint, then press ENTER.
Selecting a Go To Graphically
A graphical Go To can be used to select one of three items from
the map display: an existing waypoint, on-screen map items such
as roads, rivers, cities, and navaids, or a new map point. If you are
selecting a map item as the Go To destination, the GPSMAP 188/
188C Sounder automatically uses the name of the map item, but
the point is not stored in the waypoint list. See page 21 for creating
waypoints using map items. If you are selecting a new map point
(non-map item) as the Go To destination, the GPSMAP 188/188C
Sounder automatically creates a waypoint at the pointer location.
To activate an existing waypoint or map item as a Go
To from the map display:
1. Use the ROCKER to highlight the waypoint or on-screen
map item, and press NAV. When Go To <waypoint name>
appears, press ENTER.
Or
Highlight the waypoint or map item, and press ENTER.
2. Highlight the Go To button at the bottom of the window, and
press ENTER.
GPSMAP 188/188C Sounder Owner’s Manual
13
BASIC OPERATION > NAVIGATING TO A DESTINATION
To Go To a new map point (non-map item):
1. Use the ROCKER to move the map pointer to the location
you want.
2. Press NAV.
3. With Go To MAP Point highlighted, press ENTER.
TracBack Navigation (Navigating a Track)
The TracBack function retraces your path using the track log
automatically stored in the receiver’s memory. This feature
eliminates the need to store waypoints along the way. TracBack
routes are created by reducing your track log into a route of up to
254 turns and activating an inverted route along those points. When
activated, a TracBack route leads you back to the oldest stored
track log point, so it is a good idea to clear the existing track log
before you start your current trip.
You must save a track before using the Follow Track option.
14
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > NAVIGATING TO A DESTINATION
To clear the track log and define a starting point for a
TracBack route:
1. Press MENU twice to display the Main Menu.
2. Using the ROCKER, highlight the Track tab, and highlight
the Active sub tab.
3. Use the ROCKER to select the Erase, and press ENTER.
4. Highlight the OK, and press ENTER.
You must save the track log before you can use Follow Track. The
Save feature stores up to 15 track logs.
To save a track log:
1. From the Main Menu, use the ROCKER to highlight the
Track tab, and then highlight the Active sub tab to the right.
2. Use the ROCKER to select Save, and press ENTER.
3. From the Save Back Through window, highlight time,
date, or Entire Log, and press ENTER. When the track is
saved, the Save Track window appears. The default name,
distance, number of points (500 max), and color are in the
Save Track window.
To change the name of the saved track, highlight the name
field, and press ENTER. Make your changes, and press
ENTER.
To view the track on the map, highlight Review on Map,
and press ENTER. Pressing MENU to activate the Measure
Distance (see page 32) and Point to on Main Map options,
then exit the Save Track window. Press QUIT to return to
the Save Track window.
4. Highlight OK, and press ENTER to save the track.
5. Press QUIT to exit.
Default Track Name
Total number of points
Total Distance
Check this box to
display track
Change color
of track line
To display the track on the Map and Highway Pages,
highlight the check box to the left of Show on Map and
Highway, and press ENTER.
GPSMAP 188/188C Sounder Owner’s Manual
15
BASIC OPERATION > NAVIGATING TO A DESTINATION
To activate a TracBack using the NAV key:
1. Press NAV, highlight the Follow Track, and press ENTER.
2. Highlight the track you want to follow, and press ENTER.
3. Choose Original to navigate from the start to the end of
your trip, or choose Reverse to navigate from the end to the
start of your trip, and press ENTER.
4. To stop TracBack navigation, press NAV, highlight Stop
Navigation, and press ENTER.
When a TracBack is active, the GPSMAP 188/188C Sounder
takes the track log currently stored in memory and divides it into
segments called legs. Up to 50 (188) or 254 (188C) temporary
turns (BEGIN, TURN 1, TURN 2, TURN 3,...., TURN X, END)
are created to mark the most significant features of the track log in
order to duplicate your exact path as closely as possible. To get the
most out of the TracBack feature, remember the following tips:
• If the track log interval is set to the Time option, the route
can not follow your exact path. For best performance, keep
the interval set to resolution.
• If the receiver is turned off or satellite coverage is lost during
your trip, the TracBack draws a straight line between any
point where coverage was lost and where it resumed.
• If the track log’s changes in distance and direction are too
complex, 254 waypoints can not mark your path accurately.
The receiver then assigns the 254 waypoints to the most
significant points of your track, and simplifies segments with
fewer changes in direction.
For more information on setting up the Track options and saved
tracks, see page 59.
• Always clear the track log at the starting point.
• Set the Record Mode option on the track log setup page to
Fill or Wrap.
• The track log memory must contain at least two points to
create a TracBack route.
16
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > ROUTES
Routes
To create a route using the Route Edit Map Page:
You can create and store up to 50 user-defined reversible routes
(numbered 1-50), with up to 254 waypoints each. Routes are
created and modified in two ways. The first method creates the
route using a map page. This method selects points on the map.
The second method enters the waypoint names as text on the Route
Review Page. This method lists the waypoints as you create the
route. All of the route functions are accessed through the Main
Menu or the NAV key.
Route Tab
GPSMAP 188/188C Sounder Owner’s Manual
1. Press MENU twice to display the Main Menu.
2. Use the ROCKER to highlight the Route tab, and press
MENU to display the route options page, or highlight the
first available blank route slot, and press ENTER. (Go to
step 4 if you use this method.)
3. Select New Route, and press ENTER.
4. To add an existing waypoint or map item to the route, use
the map pointer to select a waypoint or map item, and press
ENTER. Map items do not appear in the waypoint list. To
create a waypoint from a map item, see page 21.
5. To add a new waypoint to the route, use the map pointer
to select a map location, and press ENTER. Press ENTER
again to confirm the new waypoint. You can also change the
name and symbol of the new waypoint (see page 8).
As you add each new waypoint to the route, the data
window at the top of the map display shows the waypoint/
map item name, bearing and distance from your location,
and coordinates of the pointer. The bottom of the display
shows the number of available and used points. A route line
appears on the map to indicate each completed leg, and a
dotted line appears indicating the distance and bearing to
the arrow pointer from the last route waypoint.
17
BASIC OPERATION > ROUTES
6. Repeat steps 4 and 5 until you have finished defining all
route waypoints.
7. When finished, press QUIT twice to return to the Route
List. Highlight Edit as Text, and press ENTER to return to
the Route Review Page.
To create a route using text on the Route
Review Page:
1. Press MENU twice to display the Main Menu.
2. Use the ROCKER to highlight the Route tab, and press
MENU to display the route options menu, or highlight the
first available blank route slot, and press ENTER. (Go to
step 4 if you use this method.)
3. Select New Route, and press ENTER.
4. Press MENU, select Edit as Text, and press ENTER.
5. Use the ROCKER to highlight the first field under the word
Waypoint, and press ENTER.
ADD appears below the
pointer as you insert points.
Choose the category you want to
add a route point from.
18
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > FIND
6. From the Find menu, highlight Waypoints or another
menu item, and press ENTER. From either the By Name
or Nearest tab lists, choose a waypoint, and press ENTER.
(See page 50 for searching for waypoints by name.)
7. On the Waypoint Review Page, OK is automatically
highlighted. You can use Show Map to view a point on the
map. When finished viewing, press QUIT to return to the
Waypoint Review Page. Press ENTER to add the point to
the route. The next field automatically highlights.
8. Repeat steps 5-7 until all the route points are entered.
Press QUIT to return to the Route List.
Find
Use the FIND key to search the unit for user waypoints, map items
and any BlueChart or MapSource information loaded to the unit
or on a data card. Press FIND to display a list of available find
categories. The default items are Waypoints, Cities, Tide Stations,
and Transportation. If you press FIND and you are in Pan Mode,
the unit centers its search from the map pointer location.
Find Items List
Choose a waypoint from either the
By Name or Nearest tab list.
GPSMAP 188/188C Sounder Owner’s Manual
19
BASIC OPERATION > FIND
To Find an item from your current location:
1. From any page, press FIND.
2. Using the ROCKER, highlight a category from the list, and
press ENTER.
3. For Waypoints and Cities, search using By Name or
Nearest. Use the ROCKER to highlight a tab. For By
Name, use the top field to spell out the name, or scroll down
through the list. (See page 8 for steps on entering a name.)
To Find an item from other locations:
1. From the Map Page, use the ROCKER to pan to a location,
and press FIND.
2. Using the ROCKER, highlight a category from the list, and
press ENTER.
You can also Find
from items found on
the Find List.
20
The Find option also supports a “find from” feature that centers
your search around an item you have just found. For example,
you search for “Restricted Areas” and you find a point named
“Anchoring Prohibited.” If you press FIND again, “From
Anchoring Prohibited” appears as the new search from point.
You can also use the Find feature to center your search from any
waypoint, route list entry, map item, or tide station. Highlight the
item you want to find from, and press FIND.
• Nearest To Boat—centers search from your boat’s current
location.
• Nearest To Other—centers your search around another map
location.
• Nearest To Next—centers search from the next point of your
active route.
• Nearest To Destination—centers search from the last point
of your active route.
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > ADDITIONAL INFORMATION
To Find an item using the Find options:
1 From any page, press FIND.
2. Using the ROCKER, highlight a category from the list, and
press ENTER.
3 From the search results list, press MENU, highlight an
option, and press ENTER.
Additional Information
Items located using the Find feature have information about the
point available. The information varies depending on the type of
data loaded on the optional data card. Sub tabs along the top of the
detail window contain the information available for the item. Any
additional options are displayed along the bottom.
To view additional information for a Find item:
1. From the Find list, highlight an item, and press ENTER.
2. Use the ROCKER to highlight the individual tabs and
display the information. To scroll the text, highlight the field,
and press ENTER. Use the ROCKER to scroll.
Or
Press MENU, and choose a scroll option.
Additional
Information Tabs
Find Menu Options
Distance,
Bearing,and
Coordinates of item
Additional Options
Information Window
GPSMAP 188/188C Sounder Owner’s Manual
21
BASIC OPERATION > DSC
DSC
The DSC tab on Main Menu controls and sets up the Digital
Selective Calling (DSC) features on the GPSMAP 188/188C
Sounder.
DSC uses marine VHF radio and Global Positioning System (GPS)
technologies to transmit and receive location information. The
chartplotter repeats the call properties received from the VHF radio
on the chartplotter. The GPSMAP 188/188C Sounder requires input
from a DSC enabled VHF radio to display position, and sound/
display alerts from a Distress Call or Position Report. Conversely,
the VHF radio requires input from a GPS to transmit position
coordinates for a Distress Call or Position Report. For connection
information, refer to “Connecting the Power/Data Cable” on
page 98.
An emergency DSC Distress Call allows a vessel in trouble
to transmit a substantial amount of information in a single
transmission or call, without the need for voice communication.
When any nearby rescuers receives the DSC signal, an alarm
sounds and they immediately receive the location of the caller.
The rescuer can choose to navigate to the caller’s location to
assist, or forward the call on to the Coast Guard. When the Coast
Guard receives the call, they can immediately access the caller’s
information (such as
22
who they are and the type of vessel) in their database while they
are in transit to the caller’s location.
A non-emergency DSC Position Report allows mariners to
exchange and display the positions of one another. When a DSC
position is received, the mariner can choose to create a waypoint or
to show the received location on an electronic map.
Anytime a vessel receives a DSC call, they can store and quickly
navigate to that location using a Go To. To use DSC, users must
first register their VHF radios with the FCC and receive a Maritime
Mobile Service Identity (MMSI) number. Garmin does not provide
MMSI numbers.
For more information about Digital Selective Calling and Maritime
Mobile Service Identity (MMSI) numbers, refer to page 103 in the
“Appendix.”
Understanding Distress Calls
When the GPSMAP 188/188C Sounder receives a Distress Call
from a connected DSC-enabled VHF radio, an alert message and
notification page appear, and an alarm tone sounds. Distress Calls
are shown in the DSC Call List and Log with a checkered symbol.
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > DSC
Understanding Position Reports
A Position Report is similar to a Distress Call except no alarm is
sounded. Position Reports are not broadcast to all DSC users and
are shown with a boat symbol.
Receiving DSC Calls
Each time you receive a Distress Call or Position Report, a
Notification Page is appears, and the call is placed in the DSC Call
List and Log. The Notification Page contains information about
the call including the type of call (distress or position report),
the MMSI number of the caller, a user definable name, the time
and date of the call, the Bearing and Distance from your current
position, and the coordinates of the caller. To see the caller’s
location on a map, select the Show Map button. To create a
waypoint at the caller’s location, select the Create Wpt button. To
close the Notification Page, press QUIT.
GPSMAP 188/188C Sounder Owner’s Manual
When a Distress Call or Position Report is placed in the Call List
and Log, the information on the Notification Page is retained.
To review a DSC call or log entry, highlight the entry, and press
ENTER. The DSC Entry Review window is identical to the
Notification window with one exception, the entry can be deleted.
DSC Entry Review Window
To review a call or log entry:
1. Press Menu twice.
2. Open the Call List or Log from the DSC tab.
3. Press up or down on ROCKER to highlight the call you want
to review.
4. Press ENTER to open the DSC Entry Review window.
23
BASIC OPERATION > DSC
DSC Call List
The DSC Call List displays the 50 most recent calls, even if the unit
is left unattended. The Call List displays the most recent call from a
vessel. If a second call from the same vessel is received, it replaces
the first call in the Call List. Press MENU to sort the list and delete
entries.
DSC Log
When DSC calls are received, they are automatically placed in the
Log, with the most recent call at the top. The unit can log up to 100
calls. When 100 calls are logged, the oldest log is removed when a
new call is received. Press MENU to sort the list and delete entries.
DSC Directory
The DSC Directory acts much like a phone book and can hold up
to 50 entries. Pressing MENU from this page displays options to
add a New Item, Delete a highlighted entry, or Delete All entries.
3. Enter the MMSI number, a Name, and any comments.
4. When finished, highlight OK, and press ENTER.
New Directory Item Page
When a Distress Call, Position Report, or Directory item is named,
the name is attached to that particular MMSI number. If a name is
used, all DSC entries of the same MMSI number show the name.
To add a new Directory entry:
1. Open the DSC Directory in the Main Menu.
2. Use the ROCKER to highlight the first blank space in the
directory list, and press ENTER.
Or
Press MENU, highlight New Item, and press ENTER.
24
GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > DSC
Navigating to a Position Report or Distress Call
After a Position Report or a Distress Call is received, navigation
can be quickly set to the call location.
To navigate to Position Report or Distress Call:
1 Press NAV.
2. With Go To MMSI/Name highlighted, press ENTER.
Or
1. Highlight the call on the Call List or Log, and press NAV.
Setting up DSC
The DSC Setup sub tab turns DSC chartplotter information display
On and Off. This Setup tab also allows you to simulate Distress
Calls and Position Reports while the unit is in Simulator Mode
(see page 3). Simulating calls is helpful for practice before
connecting to the real system. The Distress Call simulator also
helps to check if alarms are working properly.
2. With Go To MMSI/Name or DSC highlighted, press ENTER.
DSC Setup
Navigating to a DSC Call
GPSMAP 188/188C Sounder Owner’s Manual
25
MAIN PAGES > OVERVIEW
MAIN PAGES
Six main display pages are always available: Map Page, Sonar Page, Pointer Page, Numbers Page, Highway Page, and Active Route Page.
You can cycle through these pages by pressing either PAGE or QUIT. For information on the Sonar Page, refer to the “Using Sonar”
section on pages 78-91.
With the Map Page displayed, press PAGE several times. Each time you press PAGE the next main page appears. Do the same with the
QUIT key. QUIT acts the same as PAGE, except the pages are displayed in a reverse sequence.
Each main page has an options menu. Options menus contain the setup options and functions that apply to that page. Press MENU to
display the options menu. Use the ROCKER to select an item from the options menu and press ENTER. Many of the menus in the
GPSMAP 188/188C Sounder are arranged in a tab layout. Use the ROCKER to move left or right from tab to tab.
Notice that either PAGE or QUIT stops the current function and returns you to the main page. If you find yourself lost in a menu or you
start a function you do not want, press PAGE or QUIT.
Map Page
26
Sonar Page
Pointer Page
Numbers Page
Highway Page
Active Route Page
GPSMAP 188/188C Sounder Owner’s Manual
MAIN PAGES > MAP PAGE
Map Page
The Map Page provides a comprehensive display of electronic
cartography, plotting, and navigational data. When in the BlueChart
data coverage area or using optional MapSource software, the
map display shows your boat on a digital chart, complete with
geographic names, map items, navaids, and a host of other chart
features. It also plots your track and displays any routes and
waypoints you create. A map pointer allows you pan and scroll to
other map areas, determine the distance and bearing to a location,
and perform various route and waypoint functions.
When the map pointer is active, an additional data window appears
below the data fields to indicate the location, range, and bearing
to the pointer, a selected waypoint, or map item. The map range
displays at the bottom right of the page.
The Zoom IN and OUT keys combined with the ROCKER, allow
you select zoom ranges and move the pointer. Two basic map
operating modes, Position Mode and Pointer Mode, determine what
cartography is shown on the map display. Position Mode moves the
cartography to keep the present location marker within the display
area. Pan Mode moves the cartography to keep the map pointer
within the display area.
GPSMAP 188/188C Sounder Owner’s Manual
Data Fields
Land
User Waypoint
Map Item
Position Triangle
Navaids
Water
Geographic
Name
Map Range
Map Page shown using
optional MapSource data.
The GPSMAP 188/188C Sounder system starts in the Position
Mode, with your location centered on the map display. When
sufficient map coverage is not available to keep your location
centered, the position triangle moves toward the edge of the
display.
Pan Mode starts when the ROCKER is pressed. The pointer
is moved over the map display using the ROCKER. When the
pointer reaches the edge of the display, the map scrolls forward
under the pointer.
27
MAIN PAGES > MAP PAGE
Using the Map Pointer
The pointer pans away from your present location (even outside
of your current detail coverage.) As you pan past the edge of the
current map display, the screen actively scrolls forward to provide
continuous map coverage. An hourglass symbol appears by the
pointer while the unit is busy drawing new map details.
Additional
Information Tabs
Pressing ENTER while
highlighting a map item
brings up additional
details and options.
Additional Options
Move the pointer
over an item
on the map to
highlight it.
As you move the pointer, the distance and bearing from your
present location to the pointer is displayed in the data window,
along with the pointer’s location coordinates. Keep in mind that
when the pointer is stationary, the distance and bearing from your
present position changes as your location moves. The pointer can
also be used to view on-screen waypoint and map item properties
directly from the map display.
28
To select an on-screen waypoint or map item with the
map pointer:
1. Use the ROCKER to move the map pointer to a waypoint or
map item. (If there are several waypoints grouped closely
together, zoom in closer for a better view.)
2. When a waypoint or map item is selected, it is highlighted
on-screen, with the name and location displayed. Press
ENTER to show details of the map item. When in the
BlueChart coverage area or using optional MapSource
data, additional information tabs appear. Use the ROCKER
to highlight the individual tabs, and display additional
information and options.
3. Press QUIT to re-center your location on-screen.
GPSMAP 188/188C Sounder Owner’s Manual
MAIN PAGES > MAP PAGE
Use the pointer to create new waypoints directly from the map.
To create a waypoint with the pointer:
1. Use the ROCKER to move the pointer to the map location.
2. Press ENTER. The New Map Waypoint window appears.
(If the pointer is on a map item, press ENTER, and a new
window with details about the item appears.)
3. Press ENTER again on the highlighted Create Wpt option.
4. Press ENTER to confirm the new waypoint using the default
three-digit name and symbol.
For more information about waypoints, see page 8.
Selecting Map Ranges
The map display has 28 available zoom ranges from 20 ft to 800 mi
(5 m to 1200 km.) The map range is controlled by the IN and OUT
keys, with the current range displayed at the bottom right of the
data window.
To select a map range:
Press the OUT key to zoom out and the IN key to zoom in.
NOTE: The range value represents the distance from one end
of the range bar to the other.
Using Built-In Basemap
Using BlueChart/MapSource Data
Overzoom, no additional data is available
GPSMAP 188/188C Sounder Owner’s Manual
29
MAIN PAGES > MAP PAGE
The GPSMAP 188/188C Sounder’s system has a built-in
worldwide database to 20 mi, with more detailed coverage
available through the use of the optional BlueChart or MapSource
data. The GPSMAP 188/188C Sounder displays cartography as
long as there is chart information available for the range you have
selected. Map coverage conforms to the following conditions:
• When the selected zoom range is covered by the internal
database, BlueChart, or MapSource data, cartography is
displayed.
• When the selected zoom range is covered by both
the internal database and BlueChart/MapSource data,
cartography is displayed using the data with the best
resolution.
• When the selected zoom range exceeds the resolution of the
data in use, an Overzoom warning appears below the range.
30
Map Page Options
Many features of the GPSMAP 188/188C Sounder are menu
driven. Each main page has an options menu, allowing you to
customize the corresponding page to your preferences and select
special features that specifically relate to that page. The data
window, located at the top of the main pages, provides a userselectable layout of various types of useful data. Each data field can
be configured to display any one of several data options. The data
window layout can be configured to display additional data fields
and change the size of the data displayed.
To display and select the Map Page options:
1. Press MENU.
2. Use the ROCKER to highlight an option, and press ENTER.
The available options are Full Screen Map/Show Data, Change
Numbers, Measure Distance, Show Sonar (If equipped with a
transducer, see the “Using Sonar” section on pages 78-91 for
details on this feature,) Set Up Map and Turn Declutter On/Off.
Following are details on using each of these options.
GPSMAP 188/188C Sounder Owner’s Manual
MAIN PAGES > MAP PAGE
Change Numbers—specifies the type of data displayed in each
data field used on the map display.
To change a data field:
1. From the menu, use the ROCKER to highlight the Change
Numbers option, and press ENTER.
2. Move the field highlight to the data field you want to change,
and press ENTER.
3. Move up or down on the list using the ROCKER to highlight
the data you want to display, and press ENTER. To exit,
press QUIT.
Map Page Options
Full Screen Map/Show Data—toggles between the Map Page
without or with data fields on the map display.
To maximize the map/show data fields:
1. Highlight Full Screen Map, and press ENTER. The Map
Page is now maximized with no data fields.
2. To show the data fields again, press MENU, highlight Show
Data, and press ENTER.
NOTE: Pointer, Highway, Location, and Sonar field options
are only available on medium and large sized data fields.
GPSMAP 188/188C Sounder Owner’s Manual
31
MAIN PAGES > MAP PAGE
You can also merge the four medium default data fields to a single,
large field for better readability or you can split any or all of the
default data fields to show four small data fields.
3. Move the pointer to the end measurement point. The
bearing and distance from the reference point and pointer
coordinates appears in the data window at the top of the
display. Press QUIT to finish.
Single, large data
field
Pointer
Coordinates
Default, medium
fields
Distance and
Bearing
Split, small
fields
Map Pointer
Measure Distance—measures the bearing and distance between
any two points on the map display.
To measure the bearing/distance between two points:
1. Highlight Measure Distance, and press ENTER. An
on-screen pointer labeled ENT REF appears on the map
display at your present location.
2. Move the pointer to a reference point (the point that you
want to measure from), and press ENTER.
32
Full screen map shown
(with BlueChart data)
GPSMAP 188/188C Sounder Owner’s Manual
MAIN PAGES > POINTER PAGE
Set Up Map—configures the map display preferences, including
map detail, map orientation, automatic zoom, and various map
items and points. Refer to “Main Menu—Map Tab” on page 64 for
more information.
To change a map setup feature:
1. From the Map Page menu, highlight Set Up Map, and press
ENTER.
2. Press left or right on the ROCKER to highlight a tab, then
press up or down on the ROCKER to highlight the setting
you want to change, and press ENTER.
3. Press up or down on the ROCKER to highlight to a setting,
and press ENTER. To exit, press QUIT.
From the map setup page, you can access the following menu
options by pressing MENU.
• Defaults—restores settings back to factory settings for the
tab highlighted.
• All Map Defaults—restores settings back to factory settings
for all tabs.
Turn Declutter On/Off—toggles between showing BlueChart spot
soundings and map outlines for easier viewing.
GPSMAP 188/188C Sounder Owner’s Manual
Pointer Page
The Pointer Page provides graphic steering guidance to a
destination waypoint, with an emphasis on the bearing to your
destination and current direction of travel. The middle of the
page features a rotating compass ring that shows your course
over ground (track) while you are moving, and a bearing pointer
that indicates the direction of the destination (bearing) relative
to the course over ground. The compass ring and pointer arrow
work independently to show—at a glance—the direction of your
movement and the direction to your destination. For instance, if
the arrow points up, you are going directly to the waypoint. If the
arrow points any direction other than up, turn toward the arrow
until it points up—then continue in that direction.
The current speed, distance to the next waypoint, turn angle and
current location are displayed at the top of the screen. This page
provides better steering guidance when traveling at slower speeds
or when making frequent directional changes. When you are not
navigating to a waypoint, the compass ring shows the current
direction of travel but the arrow does not appear.
NOTE: The bearing pointer, bearing bug, and compass ring
can point in various directions when you are stationary or at
very low speeds. Once you start moving, the pointer is correct.
33
MAIN PAGES > NUMBERS PAGE
Numbers Page
Current
Go To
Destination
Data
Fields
Bearing
Bug
Bearing
Pointer
Compass
Ring
The Pointer Page features a menu page that provides access to
layout and data field options. The data window, located at the top
of the page, provides a user-selectable layout of various types of
useful data. Each data field can be configured to display several
data options. The data window layout can be configured to display
additional data fields and change the size of the data displayed.
The Numbers Page provides for precision navigation to one degree
of steerage. The default page displays three large numbers fields.
You can customize the Numbers Page to display the size and
number of fields along with the type data you want to see. See
page 31 for instructions on changing the data fields.
The Numbers Page provides a quick reference for the important
data you want to display. By default, the page displays three large,
user-selectable data fields showing a compass ribbon, speed, and
current location coordinates. You can also choose to show the three
data fields in large lettering for better readability or you can split
any or all of the data fields to show four smaller data fields. See
page 31 for detailed instructions on changing the data fields and
layout of the Numbers Page.
To display and select the Pointer Page options:
1. Press MENU.
2. Use the ROCKER to highlight an option, and press ENTER.
For detailed instructions on changing the data fields and
layout of the Pointer Page, see page 31.
34
GPSMAP 188/188C Sounder Owner’s Manual
MAIN PAGES > HIGHWAY PAGE
Highway Page
Numbers Page
shown with middle
data field split into
four fields
The Highway Page provides graphic steering guidance to a
destination waypoint, placing greater emphasis on the straight-line
course, and the distance and direction you are off course. As you
head toward your destination, the middle of the screen provides
visual guidance to your waypoint on a moving graphic highway.
Your present location is at the bottom center of the highway
display. The line down the middle of the highway represents your
course. As you navigate toward a waypoint, the highway moves—
indicating the direction you are off course. To stay on course, steer
toward the center of the highway.
To split the data fields:
1. Press MENU, and press ENTER.
2. Highlight a data field, and press MENU.
3. Highlight Split Numbers, and press ENTER. Four new data
fields appear. Press QUIT to finish.
4. To return to the original configuration, repeat steps
1 and 2, but instead of Split Numbers, select either Merge
Numbers or Defaults. Press QUIT to finish.
GPSMAP 188/188C Sounder Owner’s Manual
Steer toward
the center of the
highway or toward
the black vertical
bar on the compass
ribbon to get back
on course.
35
MAIN PAGES > HIGHWAY PAGE
The four data fields at the top of the page provide additional
user-selectable guidance information. Additionally, a compass
ribbon shows your current heading along with a dark vertical bar
that indicates the direct bearing to the navigation point. When the
dark, vertical indicator (or arrow) lines up with the lighter red bar
in the middle, you are heading directly to the navigation point.
Use the Highway Page as your primary navigation page in lieu of
the Pointer Page when your main concern is following a defined
course.
Current
Waypoint
Data Fields
36
To zoom in or out on the highway display:
Press either the IN or OUT key to increase or decrease the
zoom range.
Highway Page Options
The Highway options page defines the data fields and selects the
waypoints and tracks that are displayed. The data window, located
at the top of the page, provides a user-selectable layout of various
types of data. Each data field can be configured to display several
data options. The data window layout can be configured to display
additional data fields and change the size of the data displayed.
To display and select the Highway Page options:
Course
Present
Location
You can zoom in or out on the Highway display for a smaller or
larger view. Five available settings range from 1X to 16X, with a
default setting of 8X. The current range appears in the bottom right
of the display.
1. Press MENU.
2. Using the ROCKER, highlight an option, and press ENTER.
Zoom
Range
GPSMAP 188/188C Sounder Owner’s Manual
MAIN PAGES > ACTIVE ROUTE PAGE
Active Route Page
Check or uncheck
the options you
want to show/hide
on the Highway
Page.
The Active Route Page shows each point of the active route, with
the point name, distance and choice of Course, ETA, Fuel, Leg
Distance, Leg Fuel, Leg Time, Sunrise, Sunset, or Time To for each
point from your present location. The current destination point is
marked with an arrow icon. As you navigate a route, the waypoint
list automatically updates to indicate the next active point first. The
Active Route and Route Review Pages share many of the same
features and options. For more information on the Active Route
Page, see page 17.
Preview Window
Highway Page Set Up
NOTE: The Active Route Page only appears when the unit is
navigating to a destination using a route, TracBack, or Go To.
The following options are available from the Highway Page menu:
Set Up Highway—selects what waypoints and tracks are shown
on the Highway display. Use the ROCKER and ENTER keys to
select or deselect the options.
Change Numbers—specifies the type of data displayed in each
data field used. For detailed instructions on changing the data fields
and layout of the Highway Page, see page 31.
GPSMAP 188/188C Sounder Owner’s Manual
Active Route Page
37
MAIN PAGES > ACTIVE ROUTE PAGE
Active Route Page Options
The following options are available from the Active Route Page:
• Hide/Show Numbers—see page 31 for instructions (same
as Map Page option).
• Change Numbers—see page 31 for instructions.
• Edit on Map—see page 17 for instructions.
• Add Before—see page 17 for instructions.
• Remove—see page 17 for instructions.
• Invert—reverses the direction of the route.
• Re-evaluate—recalculates and reactivates the current route.
• Invert—reverses the route.
Re-evaluate—reactivates the current route and selects the route
leg closest to your current location as the active leg. The active leg
defines the current from and to waypoints.
To re-evaluate an active route:
1. From the Active Route Page, press MENU.
2. Using the ROCKER, highlight Re-evaluate and press
ENTER to recalculate.
To invert an active route:
1. From the Active Route Page, press MENU.
2. Using the ROCKER, highlight Invert, and press ENTER to
reverse the route.
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GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > GPS TAB
MAIN MENU
The Main Menu provides access to various waypoint, system,
navigation, interface management, and setup menus. The 19 Menu
tabs are divided into categories by function. The Main Menu is
available from any page in the system, and is accessed by pressing
MENU twice. See page 6 for additional instructions on changing
settings and entering data.
Sub Tabs
To select a Menu tab from the Main Menu Page:
1. Press up or down on the ROCKER to highlight a tab. The
information for the highlighted tab automatically appears
to the right. If you want to select any of the sub tab items,
press right on the ROCKER, and press up or down to select
individual items.
2. Either press MENU for additional submenu options, or press
ENTER to make changes to the highlighted item. Press left
on the ROCKER to get back to the Main Menu tabs list.
3. Press QUIT to return to the Main Menu.
GPS Tab
The GPS tab provides a visual reference of satellite acquisition,
receiver status, and accuracy. The status information provides
an idea of what the receiver is doing at any given moment. The
sky view and signal strength bars give you an indication of what
satellites are visible to the receiver and whether or not they are
being tracked. The signal strength is shown on a bar graph for each
satellite, with the satellite number below. As the receiver locks onto
satellites, a signal strength bar appears for each satellite in view.
Main Menu
Tabs
Main Menu
GPSMAP 188/188C Sounder Owner’s Manual
39
MAIN MENU > GPS TAB
The progress of satellite acquisition is shown in three stages:
• No signal strength bars—the receiver is looking for the
satellites indicated.
• Light signal strength bars—the receiver has found the
satellite(s) and is collecting data.
• Dark signal strength bars—the receiver has collected the
necessary data and the satellite(s) are ready for use.
Accuracy
Sky View
Receiver
Status
DOP
Differential
Status
Signal Strength
Bars
The status field indicates a 2D or 3D, when the GPSMAP
188/188C Sounder has collected the necessary data from satellites
to calculate a fix. The unit then updates the location, date, and time.
40
You can use the sky view to help determine if any satellites
are being blocked, and whether you have a current location fix
(indicated by a 2D, 2D Differential, 3D, or 3D Differential in
the status field). The sky view shows a bird’s-eye view of the
position of each satellite relative to the receiver’s last known
location. The outer circle represents the horizon (north up), the
inner circle 45º above the horizon, and the center point a position
directly overhead. You can also set the sky view to a Track Up
configuration, causing the top of the sky view to align along your
current track heading.
WAAS Capability
The GPSMAP 188/188C Sounder is capable of receiving WAAS
(Wide Area Augmentation System) satellite signals. WAAS is an
FAA (Federal Aviation Administration) funded project to improve
the overall accuracy and integrity of the GPS signal for aviation
use, but land/sea based users can also benefit from this system. At
this time, the system is still in the development stage and is not
fully operational.
There are currently two WAAS satellites that can be received in the
U.S.A., one over the Atlantic Ocean and one over the Pacific
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > GPS TAB
Ocean, in a geo-stationary orbit over the equator. Effective use
of the WAAS satellite signal can be limited by your geographic
location in relation to those satellites, now in developmental
service. WAAS satellite signal reception requires an absolute
clear view of the sky and works best when there are no nearby
obstructions such as buildings or mountains.
WAAS satellites are numbered 33 or higher when viewing the sky
view on your GPSMAP 188/188C Sounder. Initial reception of
the WAAS signal can take up to 15-20 minutes, then 1-2 minutes
afterward. When WAAS differential correction has been received
for GPS satellites (numbers 32 or below), a D appears in the
signal bar of the sky view and 2D or 3D Differential appears in the
receiver status. To learn more about the WAAS system, its satellite
positions and current state of development, visit the FAA web site
(http://gps.faa.gov). Because WAAS requires CPU resources of the
GPSMAP 188/188C Sounder to search for and track the satellites,
you can disable the WAAS feature to improve unit performance
if WAAS reception is not available in your area. Refer to the
“Appendix” for more information.
GPSMAP 188/188C Sounder Owner’s Manual
To Disable/Enable WAAS capability:
1. From the GPS tab, press MENU.
2. Use the ROCKER to highlight WAAS Off or WAAS On, and
press ENTER.
Highlight WAAS Off, and press ENTER
to disable the WAAS capabilities.
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MAIN MENU > GPS TAB
• AutoLocate—the receiver is looking for any satellite whose
almanac has been collected. This process can take up to five
minutes.
• Acquiring Satellites—the receiver is looking for and
collecting data from satellites visible at its last known or
initialized position, but has not collected enough data to
calculate a fix.
• 2D—at least three satellites with good geometry have been
acquired and a 2 dimensional position fix (latitude and
longitude) is being calculated. “2D Differential” appears
when you are receiving DGPS corrections in 2D mode and a
D shows on the strength bar of satellites being corrected.
• 3D—at least four satellites with good geometry have been
acquired and your location is now being calculated in
latitude, longitude and elevation. “3D Differential” appears
when you are receiving DGPS corrections in 3D mode and a
D shows on the strength bar of satellites being corrected.
• Poor GPS Coverage—the receiver is no longer tracking
enough satellites for a 2D or 3D fix.
• Receiver Not Usable—the receiver is unusable, possibly
due to interference or abnormal satellite conditions. Turn the
unit off and back on to reset.
• Simulating—the receiver is in Simulator Mode.
42
The Differential Receiver status shows one of the following:
• Off—No optional beacon receiver attached or enabled in the
Comm menu or WAAS Off.
• Searching For WAAS—WAAS is enabled and receiver is
searching for WAAS signal.
• Using WAAS—WAAS capability enabled and unit receiving
WAAS corrections.
• No Beacon Signal—DGPS receiver attached, but not
transmitting RTCM data to GPS.
• Tuning Beacon—receiver is tuning manual DGPS
frequency.
• Receiving Beacon—unit is receiving DGPS corrections.
• Scanning Beacon—DGPS receiver is scanning for available
frequency.
The Differential SNR (Signal to Noise Ratio) indicates, on a range
to 0-30db with 30db being the best, the strength of the DGPS signal
being received. The SNR depends on the mounting of your DGPS
receiver and the distance from the DGPS transmitting station. If
no optional DGPS receiver is used with the GPSMAP 188/188C
Sounder, the DGPS Rcvr field displays Off.
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > TIDE TAB
GPS Tab Options
The GPS tab features an options page that provides access to
functions and features relating to the GPS Info display.
To display and select the GPS Tab options:
Tide Tab
The Tide tab shows a graphical chart that displays tide station
information in a 24 hour span starting at midnight station time. You
can choose from different dates and more than 3,000 tide stations.
1. Press MENU.
2. Using the ROCKER, highlight an option, and press ENTER.
Station
Name
NOTE: If a DGPS receiver is attached to the unit and Garmin
DGPS, RTCM In/NMEA Out, or Other DGPS is enabled on
Port 2, WAAS is automatically disabled (WAAS Off). It is not
possible for the GPSMAP 188/188C Sounder to receive WAAS
and DGPS corrections at the same time.
Date
Tide
Chart
Event
Times
Tide Tab
GPS Tab Options
GPSMAP 188/188C Sounder Owner’s Manual
The top of the page displays the tide station being referenced,
below that the date. The top of the chart shows a 24-hour block of
local time (LCL) for your location, with the reported station time
(STA) appearing at the bottom. Daytime (light bar) and nighttime
(dark bar) show across the time scale, with the time progressing
from left to right. (Local time scales and sunrise/sunset info cannot
be available for a few stations). The solid, light vertical lines are
43
MAIN MENU > TIDE TAB
in 4-hour increments, and the light, dotted vertical lines are in
1-hour increments. A solid vertical line (with the current time box
at the top) indicates the time of day when using current date and
intersects the tide graph to show their relationship.
You can select from
a list of nearest
stations.
The tide curve shows as a shaded area, where higher tides are taller
(blue) and lower tides are shorter (red). The solid, horizontal line
(with the current tide box on the left) indicates the current tide
height. The figure to the left of the line shows the current tide level
in feet. The Mean Lower Low Water (MLLW) appears as a solid,
horizontal line near the bottom of the chart (This line only appears
if the tide ranges to the zero value or below). The numbers directly
below/above LCL and STA indicate the maximum/minimum levels,
respectively. The four data fields below the chart, indicate event
times and levels the tide changes starting in the upper left field,
going downward, then to the upper right and down again.
To select the nearest tide station from you current
location:
Local Time
Max. Level
High Tide
Curve
Low Tide
Curve
Min. Level
Day
Current Time Bar
1. From the Tide tab, highlight the At field, and press ENTER.
2. Highlight a tide station on the list, and press ENTER twice.
Current Tide
Height Bar
MLLW
Night
Station Time
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GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > TIDE TAB
You can automatically search for the nearest station using a variety
of search locations. You must select a location within 100 nm of
a tide station. If you are not within this range, you see a message
“None Found.” Use the Nearest To Other Find option and select a
location closer to a tide station.
To select a tide station from the map:
1. When the search results appear, press FIND, and highlight
Tide Stations.
2. Press ENTER, and then press MENU.
3. Highlight Nearest To Other, and press ENTER.
4. Select a location on the map, and press ENTER. A list
appears showing the nearest tide stations.
5. Highlight a station, and press ENTER twice. If the None
Found message appears, repeat steps 1-4 until you find a
station.
To change the date for the tide chart:
1. Using the ROCKER, highlight the On field, and press
ENTER.
2. Enter the date, and press ENTER.
To use the current date:
Press MENU, highlight Use Today’s Date, and press
ENTER.
GPSMAP 188/188C Sounder Owner’s Manual
45
MAIN MENU > TRIP TAB
Move the time bar on the tide chart in 5 minute increments to show
tide heights at various times on the chart.
To see tide heights at various times on the chart:
1. Press MENU, highlight Move Cursor, and press ENTER.
2. Press left or right on the ROCKER to change the time.
Press QUIT when finished or press MENU, highlight Stop
Moving Cursor, and press ENTER.
Trip Tab
The Trip tab displays the Trip Odometer, Moving Average speed,
Total Average speed, Maximum Speed, Stopped Time, Moving
Time, Total Time, and Odometer. To reset the data, choose from
Reset Trip, Reset Max Speed, Reset Odometer, or Reset All, and
press ENTER.
Move the pointer to
see tide heights at
different times. Tide
data shows in a black
box when in pointer
mode.
46
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > CELES TAB
Celes (Celestial) Tab
To choose a position:
The Celestial tab displays celestial data for sun and moon rise/set,
moon phase, and approximate sky view location of the sun and
moon. The moon phase displays the current visible portion of the
moon as a light color. You can display this data for your current
location, a location from the map, or a Find item location. Use the
current data, or select a different date and time.
Position
Date/Time
Sky View
Window
Sun/Moon
Event Times
Moon Phase
Sun Position
Overhead (90°)
1. From the Celes tab, highlight the At field, and press
ENTER.
2. From the Find list highlight any category except Other
Location, and press ENTER. If you want to reference a
Find item, select from the Find list, and press ENTER.
3. Select an item from the list or tab lists, and press ENTER.
4. For a location from the map, choose Other Location, press
ENTER, select a location on the map, and press ENTER.
5. From the Find item detail page, highlight OK, and press
ENTER.
The location the unit is using appears in the Date/Time/Position
field. The time tables displayed are based on your current time
zone. When using a position from another location outside of your
time zone, you need to set the Time Zone for that location. See
page 62 for more information on setting time zones.
Moon
Position
70° 45°
Horizon (0°)
GPSMAP 188/188C Sounder Owner’s Manual
47
MAIN MENU > POINTS TAB
Points Tab
The Main Menu Points tab features two waypoint sub tabs, User
and Proximity, that manage a large number of waypoints quickly
and efficiently. The sub tabs also provide a continuously updated
proximity waypoint alarm function that can be used to define an
alarm circle around items such as submerged hazards or shallow
waters.
Sub Tabs
Celestial Tab Menu
To change the time or date:
1. From the Celes tab, use the ROCKER to highlight the date
or time, and press ENTER.
2. Enter a new date or time, and press ENTER.
Main Menu
Tabs
To use current date and time:
From the Celes tab, press MENU, use the ROCKER to
highlight Use Current Date and Time, and press ENTER.
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GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > POINTS TAB
To select the Points (Waypoint) sub tab:
1. Use the ROCKER to highlight the Points tab. A list of stored
waypoints appear to the right of the Main Menu list.
2. Press right one time on the ROCKER. The User tab is now
highlighted.
3. Press down on the ROCKER until a waypoint is highlighted.
User Waypoint List
The first waypoint submenu list available from the Points tab is the
User list, which displays a master list of all waypoints currently
stored in memory. From the User list, you can review, edit, rename
or delete individual waypoints, or delete all user waypoints. The
total number of stored and available waypoints is displayed at the
bottom of the User page, with the stored waypoints arranged in
numerical/alphabetical order.
GPSMAP 188/188C Sounder Owner’s Manual
The following options are available from the User submenu of the
Points tab:
• Create Waypoint—allows you to create a waypoint. (See
page 8 for information on creating a waypoint)
• Delete Waypoint—deletes the selected waypoint from the
waypoint list and route.
• Delete By Symbol—deletes waypoints that uses the same
symbol.
• Delete All—deletes all waypoints from the unit.
NOTE: When a waypoint is deleted from the list, it cannot be
recovered from the unit. It is advisable to backup important
waypoints to a computer using an optional PC cable and
interface software or record them manually.
49
MAIN MENU > POINTS TAB
To display the waypoint menu options:
Using the ROCKER, highlight the User tab, and press
MENU.
To scroll through and review the waypoint list:
1. With the ROCKER, highlight the Points tab from the
Main Menu, and then highlight User.
2. Use the ROCKER to scroll through the list.
3. Press ENTER to review the highlighted waypoint on the
Waypoint Edit Page.
4. Press ENTER to return to the list and automatically highlight
the next waypoint.
To delete an individual waypoint from the list:
1. Use the ROCKER to highlight the waypoint to delete, and
press MENU.
2. Highlight Delete Waypoint, and press ENTER. You can
also highlight the waypoint, press ENTER, highlight Delete,
and press ENTER.
3. Select OK, and press ENTER to confirm the deletion
warning.
To search for a waypoint by name:
1. Highlight the name field, and press ENTER.
2. Use the ROCKER to select the first letter of the name.
3. Move to the right, and enter the second letter, if you do not
see the name in the list below.
4. Repeat this until the name appears. Press ENTER when
you see the name.
5. Highlight the name on the list, and press ENTER again
to review the waypoint. When finished, highlight OK, and
press ENTER.
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GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > POINTS TAB
To delete waypoints by symbol:
1. From the User sub tab, highlight the waypoint to delete, and
press MENU. Select Delete By Symbol, and press ENTER.
2. Use the ROCKER to highlight the symbol of the waypoint(s)
to delete, and press ENTER.
3. Press ENTER to confirm. To stop the deletion, choose
Cancel, or press QUIT.
To delete all waypoints or the entire waypoint list:
1. Press MENU to select the options window.
2. Use the ROCKER to highlight Delete All, and press
ENTER.
3. Highlight OK, and press ENTER to confirm.
GPSMAP 188/188C Sounder Owner’s Manual
Proximity Waypoint List
The Proximity list allows you to define an alarm circle around a
stored waypoint location, and can be used to help you avoid reefs,
rocks, or restricted waters. Up to 10 waypoints can be listed, with
a maximum alarm radius of 99.99 nautical or statute miles or
kilometers. If a proximity alarm circle overlaps with an existing
alarm circle, a “Proximity Overlaps Another Proximity Waypoint”
message appears. Because the unit only alerts for one of the
overlap points, use caution when navigating in these areas. If you
enter an alarm circle overlap, you are only alerted to the closest
proximity waypoint.
51
MAIN MENU > POINTS TAB
To add a proximity waypoint:
1. Use the ROCKER to highlight an empty space on the
Proximity list, and press ENTER. The Find screen appears.
Highlight Waypoints, and press ENTER.
2. To select a waypoint from the list, use the ROCKER to
highlight a waypoint from the User or Nearest tab.
Or
To select a waypoint from the map, highlight either the User
or Nearest tab, and press MENU. With Select From Map
highlighted, press ENTER. Use the zoom In and Out keys
and the ROCKER to highlight a waypoint.
3. Press ENTER to confirm. The distance field is now
highlighted.
4. Press ENTER to begin entry of the proximity radius.
5. Use the ROCKER to enter a distance value (to 99.99 units)
and press ENTER.
Proximity Waypoint
Proximity Circle
A dashed circle
appears showing
the alert boundary
for the proximity
waypoints.
52
To turn on or off proximity alarms:
1. Use the ROCKER to highlight the field below Proximity
Alarm, and press ENTER.
2. Select a ON or OFF setting, and press ENTER.
To display the waypoint menu options:
Using the ROCKER, highlight the Proximity tab, and press
MENU.
To clear one or all proximity waypoint(s) from the list:
1. Use the ROCKER to highlight the proximity waypoint, and
press MENU.
2. To clear a single alarm, highlight Delete Alarm, and press
ENTER.
3. To clear all proximity waypoints, select the Delete All
option, and press ENTER.
4. Use the ROCKER to highlight OK, and press ENTER.
The following options are available from the Proximity sub tab of
the Points tab:
• Delete Alarm—removes a selected waypoint from
proximity list.
• Delete All—removes all waypoints from proximity list.
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > ROUTES TAB
Routes Tab
The Route List Page displays all the routes currently stored in
memory, along with a descriptive name for each route. After a route
has been created, it can be activated and used for navigation with
the NAV key. A route can be followed in the same sequence as it
was originally created, or you can invert the route and navigate
from the end waypoint back to the beginning waypoint. From
the Route list menu, you can choose New Route (page 17), Copy
Route, Delete Route, or Delete All.
To start a route with the NAV key:
1. From any page, press NAV, highlight Follow Route, and
press ENTER. If you highlight a route from the Route
List or Route Review Page, and press NAV the window
automatically displays Follow <the route name>.
2. Highlight the route you want to navigate, and press ENTER.
3. Choose Activate or Invert and Activate, and press
ENTER. Activate uses the route as is. Invert and Activate
reverses the route, then starts.
If you highlight a route
name from the Route
List and press NAV,
the name automatically
appears.
To stop navigation of a route:
Press NAV, highlight Stop Navigation, and press ENTER.
To copy or delete a route:
1. From the Route List, highlight the route you want to copy or
delete using the ROCKER, and press MENU.
2. Choose either Copy Route or Delete Route and press
ENTER. With OK highlighted, press ENTER again to
confirm a deletion. Copy uses the same route name with
an additional number, starting at 1, at the end of the route
name.
To delete all routes:
1. From the Route List, press MENU.
2. Highlight Delete All, and press ENTER. With OK
highlighted, press ENTER again to confirm the deletion.
GPSMAP 188/188C Sounder Owner’s Manual
53
MAIN MENU > ROUTES TAB
Route Review Page
After you create a route, use the Route Review Page to review and
modify the route displayed.
Route Name
Data Fields
To show the Route Review Page:
1. Press MENU twice, and highlight the Route tab.
2. Highlight the route you want to review, and press ENTER.
Route Points
Data Totals
The Route Review Page also allows you to enter your own 15character name for any listed route. By default, the name includes
the first and last waypoints in the route.
To enter a custom route name:
Route List Menu
54
1. From the Route Review Page, highlight the name field, and
press ENTER to begin editing.
2. Use the ROCKER to enter a name, and press ENTER.
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > ROUTES TAB
When you are on the Route Review Page, you can review the route
points (waypoints or map items) one at a time from the list.
To review individual route points:
Route Review Menu Options
Menu options available from the Route Review Page are Edit on
Map, Add Before, Remove, and Trip Planning.
1. Highlight a point, and press ENTER.
2. On the waypoint review window, you can choose Next
(highlight the next point on the route list), Show Map (show
the point on a map window), or Delete (permanently delete
the waypoint from the unit), and press ENTER.
When you are back on the route point list, the next point in the
route is automatically highlighted. This allows you to review each
point on the route by pressing ENTER repeatedly.
Highlight a point, and press ENTER to review it.
Route Review Options Menu
GPSMAP 188/188C Sounder Owner’s Manual
55
MAIN MENU > ROUTES TAB
Edit on Map—allows you to review and modify the route
displayed for each point (waypoint or map item) on a map page.
Use the pointer to insert a new route point on a route leg, review
the waypoint, or map item.
To edit the route on the map:
From the Route Review Page, press MENU, highlight
Edit on Map, and press ENTER.
To edit a route point:
Use the ROCKER to highlight a route waypoint, and press
MENU.
To review a route point:
Highlight the point, and press ENTER. Press ENTER again
when finished.
A pop-up menu of editing choices appear, with options for
removing, moving (user waypoints only), or adding turns to the
beginning or end of the route.
To remove a route waypoint:
Highlight the Remove option, and press ENTER.
To move a route waypoint:
1. Highlight the Move option, and press ENTER.
2. Move the pointer to the new map location, and press
ENTER.
56
To add turns at the beginning or end of the route:
1. Select the first (to add waypoints to the beginning of the
route) or last (to add waypoints to the end of the route)
route waypoint with the map pointer, and press MENU.
2. Highlight the Add option and press ENTER.
3. Move the pointer to the new point or location, and press
ENTER.
4. If you are not inserting an existing waypoint, press ENTER
to confirm the new waypoint.
5. Repeat steps 3 and 4 to insert additional waypoints, or
press QUIT to finish.
The route edit mode also allows you to insert a new route waypoint
in any route leg using the map pointer.
To insert a new waypoint between two existing route
waypoints:
1. Use the ROCKER to select the leg you want to insert the
new waypoint in (the route line is now highlighted and a
dotted line appears when the leg is selected), and press
ENTER.
2. Move the pointer to the new map location, existing
waypoint, or map item (ADD is displayed below the arrow
and the route lines move with the arrow), and press ENTER.
3. If you are not inserting an existing point, press ENTER to
confirm the new waypoint.
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > ROUTES TAB
Add Before—inserts a waypoint into the list of route points or add
a point(s) onto the end of the route.
To insert a point into the route, or add a point to
the end of the route:
1. From either the Route Review or Active Route Pages, use
the ROCKER to highlight the point you want to insert the
new point before (to add a point to the end, highlight the
blank field at the bottom of the list), and press MENU.
2. Highlight Add Before, and press ENTER.
3. From the Find menu, highlight Waypoints, and press
ENTER. (You can also choose from other points, such as
Cities or Tide Stations from this list.) From either the User
or Nearest From Current Location tab lists, choose the
waypoint you want and press ENTER twice. (See page 50
for information on searching for waypoints by name.)
Or
To select a waypoint from the map, highlight the User or
Nearest tab and press MENU. With Select From Map
highlighted, press ENTER. Use the zoom IN and OUT keys,
and the ROCKER to highlight a waypoint on the map, and
press ENTER.
GPSMAP 188/188C Sounder Owner’s Manual
Drag the route
leg to an existing
waypoint (shown),
map item, or a
blank spot on the
map to create a
new route point.
Remove—removes a point (waypoint or map item) from a route.
This option is available from both the Route Review and Active
Route Pages.
To remove a point from a route:
1. From either the Route Review or Active Route Pages,
use the ROCKER to highlight the point to remove, and
press MENU.
2. Highlight Remove, and press ENTER.
57
MAIN MENU > ROUTES TAB
Trip Planning—the Route Review and Active Route Pages also
display trip-planning information for each leg or the entire route.
Available information includes Course, ETA, Fuel (to point),
Leg Distance, Leg Fuel, Leg Time, Sunrise and Sunset (at point
location), and Time To (point).
Trip
Planning
Data Fields
To use the Trip Planning feature:
1. To select a planning field, highlight a route from the Route
List, and press ENTER to display the Route Review Page.
One of nine available planning fields appears to the right of
each route waypoint and its distance.
2. Press left or right on the ROCKER to select an item.
3. To enter planning information, from the Route Review
Page only, press MENU, and select Trip Planning from
the options list. Enter the figures for Speed, Fuel Flow,
Departure Time, and Departure Date. Press QUIT to return
to the Route Plan Page.
NOTE: Fuel flow rates on your unit are measured in units
per hour. System setting changes for units of measure (statute,
nautical or metric) do not affect the fuel flow measure. You
should enter fuel flow rates based on available information
for your vehicle’s (operator’s manual, or performance
specifications.) Make note of the units of measure
(gallons or liters.)
Delete Route—deletes a route from the Route List. Waypoints and
map items are not deleted from the unit’s memory.
To delete a route:
1. From the Route Review Page, press MENU.
2. Highlight Delete Route and press ENTER.
3. Press ENTER again to confirm the deletion.
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GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > TRACK TAB
Track Tab
The Track tab specifies whether or not to record a track log, define
how it is recorded, or save track log data for future use. The Track
Logs page also provides an indicator of the memory used for the
active track log and options to clear the track memory or start a
TracBack route. See page 14 for TracBack information. The Track
submenu is divided in two sub tabs: Active and Saved.
Active Sub Tab
Saved Sub Tab
The Saved sub tab displays and manages a list of any saved track
logs, allows for TracBack activation, and map display of saved
logs. The active log stores up to approximately 2,500 track log
points, based on the criteria specified in the Track settings. Up to
15 track logs can be saved in memory, with up to 500 track log
points in each saved log. A TracBack can be activated from any of
the saved tracks on this tab.
The Active sub tab is for the active log (the log currently being
recorded). It displays track memory used and current settings.
Saved Sub Tab
Active Sub Tab
GPSMAP 188/188C Sounder Owner’s Manual
59
MAIN MENU > TRACK TAB
For the Active sub tab, the following settings are available:
Record Mode—contains three track recording options:
• Off—the track log is not recorded. Selecting the off setting
prevents you from using the TracBack feature.
• Fill—a track log is recorded until the track memory is full.
• Wrap—records the track log continuously. After the
available memory is full, the oldest track data is replaced
with the newest track data.
Interval—defines the frequency the track plots are recorded. Three
interval settings are available:
• Value—defines the distance or time used to record the track
log.
• Save—saves the current active track log.
• Erase—clears the active track log stored in memory.
For the Saved sub tab, the following menu options are available:
• Review On Map—displays the saved track log on a Track
Map Page.
• Delete Track—deletes the highlighted saved track log from
memory.
• Delete All—deletes all saved track logs from memory.
• Distance—records track based on a user-defined distance
between points.
• Time—records track plot based on a user-defined time
interval.
• Resolution—records track plot based on a user-defined
variance from your course over ground. The resolution
option is the default setting and is recommended for the most
efficient use of memory and TracBack performance. The
distance value (entered in the value field) is the maximum
error allowed from the true course before recording a track
point.
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GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > DSC TAB
You can use the Review On Map option to display a saved track on
a Track Map page.
To activate a TracBack from the Saved tab list:
1. Using the ROCKER, highlight a track, and press NAV. The
Follow <track name> automatically appears highlighted.
2. Press ENTER.
3. Choose either Original, which navigates you from the end
to the start of your trip, or Reverse, which navigates you
from the start to the end of your trip, and press ENTER.
DSC Tab
Digital Selective Calling (DSC) uses marine VHF radio and Global
Positioning System (GPS) technologies to transmit and receive
location information. DSC is used by mariners to assist them in two
major areas: Distress Calls and Position Reporting. See page 22
and the “Appendix” for more information on DSC and using it with
your GPSMAP 188/188C Sounder.
The track name
automatically
appears when
highlighted on the
Saved list and
NAV is pressed.
GPSMAP 188/188C Sounder Owner’s Manual
61
MAIN MENU > CARD AND TIME TABS
Card Tab
The Card tab contains options for saving waypoints, routes and
tracks to a data card. When data is saved to a data card, it can be
exchanged with other compatible units and Garmin’s MapSource
PC program.
To transfer data to/from a data card:
1. Insert the data card. From the Card tab, select the check
box next to each type of item you want to transfer.
2. Highlight Save To Card, and press ENTER to save the
selected items to the data card.
3. If transferring data from the card to the unit, highlight Merge
From Card, and press ENTER to combine the selected
items with those of your GPS.
4. Highlight Replace From Card, and press ENTER to
overwrite all selected items on your GPS. A Transfer
Complete message appears after the data is transferred.
5. Press QUIT to exit.
62
Time Tab
The time tab displays the current time and date, allows you to
adjust the 12 or 24 hour time format, enter a time zone, and adjust
for daylight saving time.
The following options are available:
• Time Format—choose from 12 or 24 hour (military) time
format.
• Time Zone—choose your correct time zone to show correct
local time or enter a UTC Offset. The UTC (also called
Greenwich Time) offset is how many hours you are ahead or
behind the time line.
• Daylight Savings Time—choose from Auto, On, or Off to
adjust for daylight saving time.
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > PAGES TAB
Pages Tab
The Pages tab allows you to turn on or off any of the main pages or
Jump To a particular page. You can also set the page that appears
first when you turn on the unit or enable/disable the GPS Info on
the initial screen.
To select or deselect a main page:
1. Use the ROCKER to highlight the box to the left of the
page name.
2. Press ENTER to select or deselect that page. When a page
is selected a check mark appears in the box. You must
leave at least one page selected.
You can also press MENU, choose from one of the following, and
press ENTER:
• All Pages—selects all pages.
• Chartplotter Only—selects the Map Page only.
• Nav Tools Only—selects the Pointer, Numbers, Highway,
and Active Route Pages only.
• Basic Fishfinder—selects the Sonar Page only if equipped
with a transducer.
• Defaults—selects all pages.
To set the first page:
First Page
Option
1. Use the ROCKER to highlight the First page option, and
press ENTER.
2. Highlight the page you want to appear first, and press
ENTER.
Pages Tab
GPSMAP 188/188C Sounder Owner’s Manual
63
MAIN MENU > MAP TAB
Map Tab
The Map tab changes the display properties of the Map Page.
The following pages contain descriptions of the Map tab’s eight
sub tabs.
General Sub Tab
• AutoZoom—On, Off: when On the map automatically
adjusts the map range to a lower range as you approach your
destination point.
• Color Mode—Water Mode, Land Mode: lightens the shade
of the water areas in Water Mode and land in Land Mode.
This option is only available on the GPSMAP 188.
Source Sub Tab
• Detail—Most, More, Normal, Less, Least: controls how
much map detail appears. This setting only applies to map
features set to Auto. Features that have a specified zoom
range or are turned off are unaffected by this setting.
• Orientation—North Up: fixes the top of the map display to
a north heading. Track Up: fixes the top of the map display
to the current track heading. Course Up: fixes the map so the
direction of navigation is always up.
64
• Basemap—On/Off: turns the built-in basemap on or off.
• Data Card Maps—On/Off: turns on or off all BlueChart or
MapSource data loaded in the unit or on the data card.
• Built-in Maps—On/Off: turns on or off all built-in
BlueChart maps.
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > MAP TAB
To display the Map Information Page:
1. Highlight the Data Card Maps button, and press ENTER.
2. Use the ROCKER to scroll through the list of maps.
3. To select or deselect a map, highlight the check box to the
left of the name of a map and press ENTER. The map is
selected and is appears on the Map Page when a check
mark appears in the box adjacent to that map.
4. To display detailed information and notes for each area,
highlight a name, and press ENTER.
5. To view the notes for that area, choose Show Notes. To
scroll through the notes, highlight the notes, press ENTER,
and use the ROCKER to scroll up, down, left, and right, or
press MENU and choose a scroll option.
GPSMAP 188/188C Sounder Owner’s Manual
Waypoints Sub Tab
The Waypoints and Active Route options each contain adjustments
for text and zoom.
• Text—None, Small, Medium, and Large: controls the screen
size of the name.
• Zoom—Auto, Off, 120 ft-800 mi: sets the maximum zoom
range features should appear on the Map Page. Some types
of data only are visible at specific zoom ranges.
65
MAIN MENU > MAP TAB
Points Sub Tab
The Spot Soundings, Tide Stations, and Services options each
contain adjustments for text and zoom.
• Text—None (except Spot Soundings), Small, Medium, and
Large: controls the screen size of the name.
• Zoom—Auto, Off, 120 ft-800 mi: sets the maximum range
features should appear on the Map Page. Some types of data
only are visible to specific zoom ranges.
66
Navaids Sub Tab
• Symbol Set—Auto, Garmin, NOAA, International: controls
a navaid symbol set.
• Text Size—Small, Medium, and Large: controls the screen
size of the name.
• Light Sectors—Off, Auto, On: controls the drawing light
sectors on the map.
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > MAP TAB
Nav Line Sub Tab
• Heading Line—On/Off: draws an extension from the end of
the boat icon in the direction of travel.
• Bearing Line—On/Off: toggles the black/white line that
points to the current navigation point.
• Course Line—Auto, Off, 120 ft-800 mi: sets the maximum
zoom range that the course line appears on the screen.
Track Sub Tab
Other Sub Tab
• Accuracy Circle—On/Off: toggles the circle On and Off.
The circle represents the approximate accuracy of the unit
based on EPE, DOP, and basemap quality. Your location is
within the circle.
• Lat/Lon Grid—Text—None, Small, Medium, and Large:
controls the screen size of the name. Zoom—Auto, Off, 120
ft-800 mi: sets the maximum range the feature should appear.
• Map Outlines—On/Off: toggles the coverage boxes for
BlueChart/MapSource data on and off.
The Saved Tracks and Track Log options each contain adjustments
for zoom.
• Zoom—Auto, Off, 120 ft-800 mi: sets the maximum range
the feature should appear on the Map Page. Some types of
data only are visible to specific zoom ranges.
GPSMAP 188/188C Sounder Owner’s Manual
67
MAIN MENU > HIWAY, TEMP, AND SONAR TABS
Hiway (Highway) Tab
The Highway tab contains display settings for the Highway Page.
Refer to the “Highway Page” section on page 35.
Temp (Temperature) Tab
Sonar Tab
The Sonar tab contains setup options for the Sonar Page. The Sonar
Page is not active if you do not have a transducer connected. Refer
to the “Using Sonar” section on pages 78-91 for more information
on sonar setup options.
The Temperature tab displays the water temperature log. The
temperature log requires input from a temperature transducer/
sensor. The most recent temperature measured displays on the far
right side of the chart with the history trailing to the left. The dotted
lines within the chart indicate intervals in the temperature range
and the duration of time.
The following settings are available:
• Temperature Scale—controls the temperature range for
displaying the log. Select Auto to have the unit automatically
determine the best range, or select a span of 2, 4, 6, 8, or 10
degrees.
• Time Duration—controls the number of temperature
readings displayed on the log. Shorter time durations display
a greater the number of log points. Use longer time durations
to detect temperature trends, instead of immediate readings.
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GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > SYSTM TAB
Systm (System) Tab
The System tab controls system setting for beeper, speed filter,
languages, system mode, and simulator controls, restores factory
settings, displays the software version, and prepares software
update cards.
The following settings are available:
• Beeper—Off, Alarms Only, Key and Alarm: controls audible
beeps for keys and alarms.
• Speed Filter—Off, Auto, On: averages speed-readings.
• Language—displays the on-screen display languages.
• System Mode—sets Normal or Simulator Mode.
• Set Position*—sets your location while in Simulator Mode.
See page 3 for additional instructions.
• Track Control*—Auto Track, User Track: controls your
heading in Simulator Mode.
• Track*—sets your heading in Simulator Mode.
• Speed*—sets your speed in Simulator Mode.
• Transducer*—sets a transducer type.
The following option is also available from the Systm tab:
• System Information—displays the unit’s software, basemap
version, and electronic serial number.
Press MENU to access the following options:
• Defaults—restores settings on Systm page to default values.
• All Unit Defaults—restores all settings to Garmin’s original
setup values for the entire unit.
* These fields are only available when the unit is in Simulator Mode.
GPSMAP 188/188C Sounder Owner’s Manual
69
MAIN MENU > UNITS TAB
Units Tab
The Unit tab defines the Position Format, Map Datum, Heading,
Distance, Speed, Elevation, Depth, and Temperature units.
The following settings are available:
• Position Format—changes the coordinate system. You
should only change the position format if you are using a
map or chart that specifies a different position format or want
to use a format with which you are familiar.
For additional information on Loran TD setup, see page 108.
NOTE: The Units tab settings affects how navigation
information is displayed on the GPSMAP 188/188C Sounder.
When in doubt, seek assistance.
If you are using a map or chart in conjunction with your GPS,
make sure the settings under the Units tab of the GPSMAP 188/
188C Sounder match that of the map or chart. This information
should be displayed somewhere on the map or chart. If the
information is not present, contact the map or chart maker to
determine what position format, datum, heading and units of
measure are being used for the map or chart.
• Map Datum—sets the datum reference used to determine
a given location. The default setting is WGS 84. The
unit automatically chooses the best datum depending on
your chosen position format. Datums are used to describe
geographic locations for surveying, mapping, and navigation.
You should only change the datum if you are using a map or
chart that specifies a different datum.
WARNING: Selecting the wrong map datum can result in
substantial position errors. Unless otherwise specified by
the navigation documentation you are using, use the default
WGS 84 datum for best overall performance.
Units Tab
70
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > UNITS TAB
• Heading—selects the reference used in calculating heading
information. You can select from Auto Mag Var, True, Grid,
and User Mag Var. Auto Mag Var provides magnetic north
heading references that are automatically determined from
your current location. True provides headings based on a
true north reference. Grid provides headings based on a grid
north reference (and is used in conjunction with the grid
position formats described on page 70). User Mag Var allows
you to specify the magnetic variation at your current location
and provides magnetic north heading references based upon
the variation you enter.
To enter a user defined magnetic variation:
1. With the Heading field set to User Mag Var, highlight the
heading reference field (immediately to the right), and press
ENTER.
2. Use the ROCKER to enter the magnetic variation at your
current location and press ENTER.
WARNING: If User Mag Var is selected, you must periodically
update the magnetic variation as your location changes. Using
this setting, the unit does not automatically calculate and
update the magnetic variation at your present location. Failure
to update this setting can result in substantial differences
between the information displayed on your unit and external
references, such as a magnetic compass.
GPSMAP 188/188C Sounder Owner’s Manual
Manually enter a
magnetic variation.
• Distance, Speed and Elevation—allows you to select the
units of measure for distance, speed, and elevation readouts
in nautical (nm, kt, m), statute (mi, mh, ft), or metric
(km, kh, m) terms.
• Depth—allows you to select the units of measure for depth
in feet (ft), fathoms (fa) or meters (m).
• Temperature—allows you to select the units of measure for
temperature in Fahrenheit (°F) or Celsius (°C).
71
MAIN MENU > COMM TAB
Comm (Communications) Tab
The Communications tab controls the input/output format used
when connecting your GPSMAP 188/188C Sounder to external
NMEA devices, a DGPS beacon receiver, a personal computer, or
another Garmin unit.
NOTE: If a DGPS receiver is used, WAAS capability is
automatically turned to off. See pages 98 and 99 for wiring and
NMEA version information.
The unit supports two input/output ports.
Port 1
• Garmin Data Transfer—the proprietary format used to
upload/download MapSource data, exchange waypoint,
route, track, almanac, and proximity data with a PC or
another Garmin unit. When you select Garmin Data
Transfer, there are 11 Transfer Modes to choose from:
Host, Request Almanac, Request Proximity, Request Routes,
Request Tracks, Request Waypoints, Send Almanac, Send
Proximity, Send Routes, Send Tracks, and Send Waypoints.
• NMEA In/NMEA Out—supports the input/output of
standard NMEA 0183 data, and sonar NMEA input support
for the DPT, MTW, and VHW sentences.
• None—provides no interfacing capabilities.
72
Port 2
• Garmin DGPS—supports connections with a Garmin DGPS
beacon receiver.
• Other DGPS—supports DGPS input using a standard
RTCM format, without any output capabilities.
• NMEA In/NMEA Out—supports the input/output of
standard NMEA 0183 data, and sonar NMEA support for the
DBT, DPT, MTW, and VHW sentences. You can also adjust
the NMEA output.
• RTCM In/NMEA Out—supports Differential GPS (DGPS)
input using a standard RTCM format and also provides
NMEA 0183 output.
• None—provides no interfacing capabilities.
NOTE: The GPSMAP 188/188C can only send DBT and DPT
NMEA sentences. It cannot input DBT and DPT sentences.
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > COMM TAB
To select a transfer mode:
1. Use the ROCKER to select Garmin Data Transfer in the
Serial Data Format field.
2. Highlight the Transfer Mode field, and press ENTER.
3. Use the ROCKER to select a setting, and press ENTER.
Advanced NMEA settings to adjust the NMEA output are available
if you have one of the ports set to NMEA In/NMEA. Advanced
NMEA settings enable/disable certain sentences and adjust the
number of Lat/Lon output precision digits. Settings affect both Port
1 and Port 2 NMEA outputs.
When transferring data between two Garmin
units, always set one to Host and use the other
unit to either Send or Request the data.
To select an input/output format:
1. Select Port 1 or Port 2, highlight the Serial Data Format
field, and press ENTER.
2. Use the ROCKER to select a setting, and press ENTER.
GPSMAP 188/188C Sounder Owner’s Manual
73
MAIN MENU > COMM TAB
To adjust the NMEA output:
1. From the Comm tab, press MENU, highlight NMEA Setup,
and press ENTER.
2. Highlight an option, and press ENTER.
3. Use the ROCKER to select a setting, and press ENTER.
Press QUIT to return to the Comm tab.
To restore the Serial Data Format settings back to the
default Garmin Data Transfer:
From the Comm tab, press MENU, highlight Defaults, and
press ENTER.
If Garmin DGPS or RTCM In/NMEA Out format is selected,
additional fields are provided to control a Garmin differential
beacon receiver directly from your GPSMAP 188/188C Sounder.
The unit can automatically scan for the DGPS beacon signal, or
you can enter the beacon frequency and bit rate on the unit and the
information is used to tune the beacon receiver.
To have the unit automatically scan for a frequency:
Advanced NMEA Output
Setup Page
74
1. With the unit set to Garmin DGPS or RTCM In/NMEA Out,
use the ROCKER to highlight the Beacon field, and press
ENTER.
2. Highlight Scan, and press ENTER. The numbers in the
Frequency field change as the unit scans from 284 kHz to
325 kHz, 200 bit rate, then 100 at 6-second intervals.
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > COMM TAB
To manually enter a frequency and bit rate:
Status Field
SNR and
Distance shows
data when signal
1. With the unit set to Garmin DGPS or RTCM In/NMEA Out,
use the ROCKER to highlight the Beacon field, and press
ENTER.
2. Highlight User, and press ENTER.
3. Highlight the Frequency or Bit Rate field, press ENTER,
enter a frequency or bit rate, and press ENTER when
finished.
The Status field shows one of the following:
NOTE: The DGPS beacon transmitters are operated by
the U.S. Coast Guard (or similar government agency in
other countries), and are responsible for their accuracy and
maintenance. For DGPS transmitter problems or to find the
most updated list of frequencies and coverage areas, contact
your local USCG, or see their Web site at
http://www.uscg.mil/.
To restart the scan:
Press MENU, highlight Restart Scan, and press ENTER.
GPSMAP 188/188C Sounder Owner’s Manual
• Tuning—the unit is attempting to tune to the specified
frequency and bit rate.
• Scanning—the unit is automatically scanning through the
frequencies and bit rates.
• Receiving—the unit is receiving DGPS signal and ready for
operation.
• Check Wiring—the unit is not making connection with
DGPS receiver.
When the unit is receiving a DGPS signal, the SNR (Signal to
Noise Ratio) and distance fields show data. The SNR range is
0dB to 30dB, with 30 being the best. The Distance can or can not
show data, depending on the signal being broadcast from the
DGPS site.
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MAIN MENU > ALARM TAB
Alarm Tab
The Alarm tab allows you to define the alarm settings. The Alarm
tab is divided into three sub tabs: System alarms, Nav alarms, and
Sonar alarms.
System Sub Tab
• Clock—provides an alarm for the system clock. Enter a
time in the time field, and turn the alarm on and off from
the control field menu. Remember to enter alarm times in
the same time format (UTC or local) you are using for your
system. The unit must be on for the clock alarm to work.
• Battery—sets an alarm to sound when the battery is
reaching a critical state of discharge.
• DGPS and Accuracy—DGPS alarm sounds when the unit
loses a differential fix. The accuracy alarm sounds when the
GPS position accuracy falls outside the user-set value.
Nav Sub Tab
• Anchor Drag—sets an alarm to sound when you have
exceeded a specified drift distance. Enter a value in the
distance field, and use the control field to turn the alarm on
and off.
76
• Arrival—sets an alarm to sound when at specified distance
or time away from a destination waypoint. Enter a distance
radius or time for sounding the alarm and use the control
field to set the alarm to Off, Dist (Distance), or Time.
• Off Course—sets an alarm to sound when you are off
the course by a specified distance. Enter a distance in the
distance field and use the control field to turn the off course
alarm on and off.
Sonar Sub Tab
You must be receiving sonar NMEA data for these functions to
work. See “Using Sonar” pages 78-91 for more information.
• Shallow Water/Deep Water—set alarms to sound when
you enter an area of specified depth that is too shallow or too
deep. Enter a depth in the distance fields and use the control
fields to turn the alarms on and off.
• Water Temperature—sets an alarm to sound when the
transducer reports a temperature either above, below, inside,
or outside the specified values.
• Fish—sets alarm to sound when unit detects a fish of the
specified symbol size.
GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > ALARM TAB
To set an alarm:
1.
2.
3.
4.
Use the ROCKER to highlight a sub tab.
Highlight the field you want to set, and press ENTER.
Enter a setting, and press ENTER.
If you want the alarm to display and beep until
acknowledged, highlight the Persist box, and press
ENTER.
GPSMAP 188/188C Sounder Owner’s Manual
If Persist is checked,
an alarm stays active
until acknowledged.
Press ENTER to
acknowledge an
alarm.
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USING SONAR > SONAR PAGE
USING SONAR
This section covers the additional sonar options for the GPSMAP
188/188C Sounder when used in conjunction with a transducer.
Read the Transducer’s Installation Instructions to properly install
the transducer.
NOTE: You MUST have a transducer installed and connected
to your GPSMAP 188/188C Sounder to use the sonar features.
Sonar Page
The Sonar Page is where your GPSMAP 188/188C Sounder
becomes a powerful fishfinder/flasher. To view the Sonar Page,
press PAGE or QUIT repeatedly until it appears. Fish are
displayed as colored arches or as fish icons. Both fish icons and
arches are displayed in three different sizes. Thermoclines are
shown as shades of blue. The area of strongest sonar return is
displayed as solid white (if Whiteline is active. Typically, the
bottom is the primary whiteline. A thin whiteline indicates a soft
bottom and a thick whiteline follows the contour of the bottom
and show any objects of reasonable size. For more information on
understanding sonar and the display, see page 89.
Adjustment
Menu
Sonar Page
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GPSMAP 188/188C Sounder Owner’s Manual
USING SONAR > SONAR PAGE
Using the Adjustment Menu
The Adjustment menu gives you direct access to the settings and
features most commonly used on the Sonar Page. The option
selected currently appears in the upper left of the display.
Press MENU and
highlight
Adjustments to see
a list of all options
and their current
settings.
To select an adjustment option from the Sonar Page:
1. Press the ROCKER left/right to scroll through the options in
the upper left of the display.
2. Press ENTER to access the option’s adjustment window.
Or
1. Press MENU, highlight Adjustments and press ENTER. A
list of all options and their current settings appears, with the
selected option highlighted.
GPSMAP 188/188C Sounder Owner’s Manual
2. Press up or down on the ROCKER to select the option, and
press ENTER to access the adjustment window.
3. To exit any of the adjustment options, press QUIT.
To change an Adjustment menu setting:
1. Select an adjustment option to change using one of the
two methods described previously. The adjustment window
automatically times out and disappears when the unit is idle
for 20 seconds.
2. Press the ROCKER up or down to place the pointer
or setting bar at the setting, range, or percentage
(Off, 1-100%).
3. Press ENTER or QUIT to exit the adjustment window,
or press left or right on the ROCKER to view another
adjustment window.
To change a setting back to Normal or Auto:
1. While on the adjustment window for the option, press
MENU.
2. Select the setting, and press ENTER.
79
USING SONAR > SONAR PAGE
Zoom Adjustment
Range Adjustment
Range—sets the display depth range used for viewing. The unit
can be set to automatically track the bottom or set to a userspecified depth range. Auto Mode displays the most information
possible while continuously showing the bottom.
Zoom—used to quickly select a display zoom range or split
the display. When a range other than No Zoom is selected, the
Adjustment Menu displays a new selection labeled View. The
Zoom setting is divided into six display levels:
80
4X Split Zoom Display (Dual Frequency Mode)
• 2X Split—shows two reduced-size sonar pictures at the
same time. The right half of the display screen shows the
complete sonar picture at its original scale. The left half
shows a portion of the original picture at 1/2 depth scale.
• 2X Zoom—displays the 2X zoomed picture on the full
screen and does not show the original depth scale.
• 4X Split—shows two reduced pictures; the right at the
original depth scale and the left at 1/4 the original depth
scale.
• 4X Zoom—displays only the 4X zoomed picture on the full
screen. However, if Dual Frequency Display is set to Split,
then a 50/200kHz split screen appears.
GPSMAP 188/188C Sounder Owner’s Manual
USING SONAR > SONAR PAGE
• Btm (Bottom) Split—shows two reduced pictures; the right
at the original depth scale and the left showing sonar returns
from the bottom up. All target depths read as a distance from
the bottom.
• Btm (Bottom) Lock—displays only the Bottom Lock
picture (returns from the bottom up) on the full screen.
However, if Dual Frequency Display is set to Split, then a
50/200kHz split screen appears.
When activated, the zoomed picture becomes the Sonar Page
display. You can also cycle through the sonar zoom display levels
by pressing the IN or OUT keys. The Zoom function can be turned
off by pressing the OUT key until the No Zoom setting appears.
View/Span—available when a Zoom scale
other than No Zoom is selected. The View or
Span setting is used to change the viewing
range of a zoomed display. If the Zoom is
set to 2X split or 4X split, only the zoomed
portion on the left side of the screen is
affected by the change. If the Zoom is set to
Bottom Split or Bottom Lock, Span adjusts
how far off the bottom the unit displays
View Adjustment data. In Zoom mode, you can control the
view of the left side of the split.
GPSMAP 188/188C Sounder Owner’s Manual
Gain—allows you to control the sensitivity
of the unit’s receiver. This provides some
flexibility in what is seen on the display.
To see more detail, increase the receiver
sensitivity by selecting a higher gain
percentage. If there is too much detail
or if the screen is cluttered, lowering the
sensitivity can increase the clarity of the
Gain Adjustment
display.
Target Level—adjusts how dark or
light a return (or target) is displayed
on-screen. A Color Bar (see page 86)
appears on the right side of the screen
as you adjust this setting. The higher
the percentage, the darker the return
appears. This setting does not increase
or decrease the unit gain.
Target Level Selection
81
USING SONAR > SONAR PAGE
Whiteline—controls how the unit displays
information about the bottom type (hard or soft).
With the Whiteline Off, the bottom return displays
as red and contains no information on bottom
hardness. With Whiteline set at Normal or 1-100%,
the bottom return becomes white with a red line
indicating where the water meets the bottom. To
turn the Whiteline Off, press the ROCKER down
until the setting bar is all the way at the bottom
Whiteline
Adjustment of the range and reads Off. See page 91 for more
detail on this feature.
Frequency—allows you to choose a transducer
frequency. Frequency refers to the pitch of the
sound that the transducer sends and receives. You
can choose 200kHz, 50kHz, or Dual frequency.
82
Frequency
Adjustment
Depth Line
Adjustment
Depth Line—adds a horizontal depth line across
the display that is used to measure the depth of
underwater objects. The depth of the line appears
in a box on the right side of the line. Press up or
down on the ROCKER to control the position of
the line on the graph. The depth is displayed in a
window on the right side of the line. To turn the
Depth Line Off, press the ROCKER up until the
setting bar is all the way at the top of the range
and reads Off.
Noise Reject—helps filter unwanted noise from
the graph. The Noise Reject tool can be turned Off,
set to Normal (automatically adjusts for optimum
viewing), or to a fixed 1-100% setting. When
setting the Noise Reject tool, the HIGHER the
noise rejection setting, the less likely the unit is
to NOT show fish or structures. To turn the Noise
Reject Off, press the ROCKER down until the
setting bar is all the way at the bottom of the range Noise Reject
Adjustment
and reads Off.
GPSMAP 188/188C Sounder Owner’s Manual
USING SONAR > SONAR PAGE
Scroll—adjusts the rate that the graph scrolls from
right to left. If you are sitting still or the graph is
moving too fast, slowing the scroll rate or pausing
it can be beneficial.
To display the Sonar Page options:
Press MENU.
To select a menu option:
Use the ROCKER to highlight the option, and press
ENTER.
The following option is available:
Adjustments—lists the Adjustment Menu options and their current
settings (see page 79).
Scroll
Adjustment
Sonar Page Options
The GPSMAP 188/188C Sounder’s Sonar Page features a menu
page that provides access to additional functions and to layout and
data field options.
To change an Adjustment setting:
1. While on the Adjustment options list, use the ROCKER to
highlight the option, and press ENTER.
2. Use the ROCKER to make the change, and press ENTER.
Show/Hide Pointer—allows you to reference sonar items and
mark underwater waypoints. This makes it easier to find and use
an object such as a stump for a future fishing location. When using
this feature, the Sonar Page pauses. The pointer does not move off
the paused display and cannot show an area that has scrolled off
the screen. The depth is updated while the display is paused, but
the unit does not show any new sonar data until the standard Sonar
Page is resumed. You can see a discontinuity from where the sonar
information stops to where it starts again.
Sonar Page Menu Options
GPSMAP 188/188C Sounder Owner’s Manual
83
USING SONAR > SONAR PAGE
4. To change the name, symbol or depth, highlight the
appropriate field and press ENTER. Make your changes
and press ENTER when finished.
5. When finished, highlight OK, and press ENTER.
Data Window
6. To return to the standard Sonar Page, press QUIT; or press
MENU, highlight Hide Pointer, and press ENTER.
Pointer
Show/Hide Numbers—toggles showing/hiding the data fields on
the sonar display.
Show Pointer Option
To mark an underwater waypoint:
1. From the Sonar Page, press MENU, highlight Show
Pointer, and press ENTER to pause the screen movement.
2. Use the ROCKER to move the pointer onto the target, such
as underwater drop offs and stumps, you want to mark. The
data window at the top of the screen displays the pointer’s
depth, coordinates, bearing, and distance from your current
location.
3. Press ENTER/MARK. The New Waypoint Page appears
with the waypoint’s coordinates, default three-digit name,
and pointer depth automatically filled in.
84
Show Numbers Option
Change Numbers—allows you to specify the type of data
displayed in each data field. For detailed instructions on changing
the data fields, see page 31.
GPSMAP 188/188C Sounder Owner’s Manual
USING SONAR > SONAR PAGE
Size Split—enables width adjustment of the Sonar Page split
screen. This option is available only when a split screen zoom scale
is selected. You can adjust the size of the split window anywhere
from 1/4 to 3/4 width of the right half of the Sonar Page.
Double-Arrow
Fish Symbols—determines how the Sonar Page displays
underwater targets and background information. If you select off,
the unit does not show fish symbols. If you select fish symbols,
the Sonar Page shows only the information related to that symbol.
Actual fish returns do not always appear as perfect arches (like
in Simulator Mode), due to the speed, fish orientation, or other
conditions.
Fish Symbols Off.
Size Split Menu Options
Suspended targets displays as fish symbols. Background
information is displayed.
Same as above with the target depth attached.
Resizing the Split Sonar Display
Sonar Tab Options
To access and change a setting on the Sonar tab:
1. Press MENU twice to access the Main Menu. Use the
ROCKER to highlight the Sonar tab.
2. Using the ROCKER, highlight the field, and press ENTER.
3. Highlight the setting, and press ENTER.
4. Press QUIT to return to the Sonar Page or a previous page.
GPSMAP 188/188C Sounder Owner’s Manual
Suspended targets display as fish symbols. No background
information is displayed.
Same as above with target depth attached.
Water Type—because sound waves travel through Fresh and Salt
water at different rates it is necessary to select the Water Type to
ensure accurate readings on the unit.
85
USING SONAR > SONAR TAB OPTIONS
Depth Number—controls the efficiency of the digital depth update
rate. Fast Update updates more quickly and is recommended for
low-noise, deeper water (>50 ft). Auto is best for shallow water or
high noise areas, and produces a slower screen update. Use Auto
when you travel a wide variety of depths.
NOTE: If the unit is unable to track the bottom for any reason,
the digits in the depth window flash on and off to alert you that
the unit is not tracking the bottom.
Color Bar—shows a gradient scale of the current Target Level
setting (see page 81).
Depth Scale (Overlay)
Color Bar
Flasher
Main Menu—Sonar Tab
Flasher—with the Flasher active, a graphic Flasher representation
is displayed on the far right side of the graph. This graphic Flasher
displays structure and bottom returns much the same as a true
Flasher. This feature is particularly useful when using fish symbols.
Scale—controls the depth Scale displayed vertically along the right
side of the graph. The depth Scale can be configured to display four
different ways: as an Overlay, in the Corners, with Basic, or No
Scale.
86
GPSMAP 188/188C Sounder Owner’s Manual
USING SONAR > SONAR TAB OPTIONS
Keel Offset—used to offset the surface reading for the depth of
a keel. This makes it possible to measure depth from the bottom
of your keel instead of from the transducer’s location. Enter a
positive number to offset for a keel, or enter a negative number to
compensate for a large vessel that can draw several feet of water.
The Keel Offset reflects in the depth reading.
Keel Offset:
Transducer at
Surface Enter (+)
positive number to
show depth from
bottom of keel
Keel Offset: Transducer
at Bottom of Keel Enter
(-) negative number to
show depth from surface
Background Color—sets the background color on the Sonar Page
to Black, Blue, or White.
Calibrate Water Speed—this is only available if you are using
a speed-capable transducer/sensor. Calibration is required to
ensure the Water Speed displayed on your unit is accurate. The
unit automatically use the GPS ground speed, if it is available,
for comparison on the calibration. If a GPS ground speed is not
available, use either your boat’s speedometer reading (not always
accurate) or a stopwatch to determine your speed over a certain
distance (distance / time = speed). It is recommended that the
calibration take place in water having little or no current.
Calibrating the
Speed Sensor
Map Split Sonar Detail—controls Map Page sonar split range
scale. Full Range shows the entire scale of 2X or 4X left side split
of Sonar Page. Maximum Detail displays what is shown on the left
side of a split sonar screen.
GPSMAP 188/188C Sounder Owner’s Manual
87
USING SONAR > SONAR TAB OPTIONS
To calibrate the water speed:
1. On the Sonar tab, use the ROCKER to highlight Calibrate
Water Speed and press ENTER.
2. Bring the boat to a cruising speed. The top ground and
uncalibrated water speeds are shown at the bottom of the
calibration window. Note your top water speed, then stop
the boat and press ENTER.
3. By default, the top ground speed automatically displays in
the What was your top water speed? field. If a ground
speed is not available, the top uncalibrated water speed is
used instead. If the new speed is correct, highlight OK and
press ENTER. If you want to manually enter a calibration,
press ENTER on the speed field, enter a new speed, and
then press ENTER.
4. You can also press MENU on the calibration screen and
choose Use Top Ground Speed to default back to ground
speed or Use No Calibration to use the speed sensor’s
uncalibrated speed.
88
NOTE: If the boat is not moving fast enough or the speed
sensor is not outputting a speed, the message “Boat Is Not
Moving Fast Enough To Calibrate” appears at the bottom of
the screen. Either verify the speed sensor wheel is moving, or
safely increase boat speed. If there is a problem with the speed
sensor/unit, or if a speed senor is not installed, a “Water Speed
Sensor Is Not Working” message appears at the bottom of the
screen. Check connections of speed sensor cables.
Page Defaults—restores the Sonar Page settings to the original
factory setup.
To restore default settings to the Sonar Tab:
1. Press MENU.
2. Highlight Page Defaults, and press ENTER.
To restore default settings to the Sonar Tab:
Press MENU. With Page Defaults highlighted, press
ENTER.
GPSMAP 188/188C Sounder Owner’s Manual
USING SONAR > SONAR TAB OPTIONS
Understanding Sonar
The transducer mounted on your vessel transmits sound waves
toward the bottom of a lake, stream, or seabed in a cone-shaped
pattern. When a transmitted sound wave strikes an underwater
object—such as the bottom, a piece of structure, or a fish—sound
is reflected back to the transducer. The transducer collects
the reflected sound waves and sends the data to the GPSMAP
188/188C Sounder to be processed and displayed. The underwater
data is shown on the Sonar display in the order that it is returned:
first returned is the first on the display.
Generally speaking, if the only thing between the transducer and
the bottom is water, the first strong return comes from the bottom
directly below the transducer and sets the bottom level. Weaker
secondary returns provide the detailed data. Stronger returns
display in darker colors, with red being the strongest return.
Understanding the Sonar Display
One of the first things to understand about sonar is that the
transducer sends a beam down to the bottom of the water, much
like the beam of a flashlight. The beam starts small near your
vessel and expands as it gets to the bottom. Refer to “Transducer
Coverage” for more detailed information.
The Sonar Page does not display a three-dimensional representation
of the underwater environment; the display is in two-dimensions,
much like if you took a picture of an aquarium. Only the depth of
the item in the water is displayed. The Sonar display does not show
you where an item is located horizontally in the water, as shown in
the drawings below. The fish is not directly above the tree in reality,
but it can look like they are on the Sonar Page.
Fish
1'
10'
Tree
Tree
20'
Aerial View of the Water
GPSMAP 188/188C Sounder Owner’s Manual
Sonar Display
89
USING SONAR > UNDERSTANDING SONAR
Transducer Coverage
The area covered by the transmitted sound waves is determined
by the cone angle of the transducer and the water depth. The wide
cone angles (40°) associated with low frequencies (50 kHz) provide
a large coverage area for finding fish within a coverage width that
is approximately 2/3 of the water depth. However, this also means
that wide cone angles produce less bottom detail and resolution.
As shown in the drawing on the near right, the 40° cone angle
produces a coverage area of approximately a 20-foot diameter
circle at a 30-foot depth.
The narrow cone angles (10°) associated with the high frequencies
(200 kHz) provide better bottom resolution and crisper detail, but
cannot show a large coverage area for finding fish. The 10° cone
angle provides a coverage width that is approximately 2/10 of the
water depth. As shown in the drawing on the far right, the 10° cone
angle produces a coverage area of approximately a 6-foot diameter
circle at a 30-foot depth.
Coverage
Diameter
Depth
Coverage
Diameter
40° Cone Angle (50 kHz)
Depth
10° Cone Angle (200 kHz)
Dual frequency mode combines both frequencies to get the best
coverage area and contour/depth readings.
90
GPSMAP 188/188C Sounder Owner’s Manual
USING SONAR > UNDERSTANDING SONAR
Whiteline
When the sonar sound waves are reflected back by the bottom,
a hard bottom returns a stronger signal than a soft bottom. A
thin whiteline indicates a softer bottom, while a thick whiteline
indicates a harder bottom. Normally, a red line is used to show the
point where water meets the bottom. This line follows the bottom
contour, along with any significant objects lying on the bottom.
The unit uses the whiteline function to make the bottom layer
information easier to distinguish.
Thermoclines
A rough definition of a thermocline is a break in water where
the water temperature changes faster than the water above it.
Thermoclines are shown as the weakest colors.
One of the unique features offered by Garmin is See-Thru®
technology, which allows the GPSMAP 188/188C Sounder to
hear both weak and strong signals simultaneously so as to identify
fish returns under the toughest conditions, such as suspended in
thermoclines or even hiding near structures. See-Thru technology
allows the transducer to see through thermoclines and locate fish.
Thick
Whiteline: Hard
bottom
Whiteline On
GPSMAP 188/188C Sounder Owner’s Manual
Whiteline Off
Thermocline
91
APPENDIX > SPECIFICATIONS
APPENDIX
Specifications
Physical Specifications
Size: 188: 6.2" H x 6.3" W x 2.6" D (15.8cm x 16.0cm x 6.6cm)
188C: 6.2" H x 6.3" W x 3.7" D (15.8 cm x 16.0 cm x 9.4 cm)
Weight: 188: 1.7 lbs. (.77Kg); 188C: 2.6 lbs. (1.18 kg)
Display: 188: 5.5" diagonal (14.1cm)
188C: 5.0" diagonal (12.7cm) 16-color TFT display with
backlighting (234 x 320 pixels)
GPS Accuracy:
Position: <15 meters (49 feet), 95% typical*
Velocity: 0.05 meters/sec steady state
DGPS (USCG) Accuracy:
Position: 3-5 meters (10-16 feet) with optional Garmin
DGPS receiver, 95% typical*
Velocity: 0.05 meters/sec steady state
DGPS (WAAS) Accuracy:
Position: <3 meters (10 feet), 95% typical*
Velocity: 0.05 meters/sec steady state
Dynamics: 6g's
Case: Fully gasketed, high-impact plastic alloy, waterproof to IEC
529-IPX-7
* Subject to accuracy degradation to 100 m 2DRMS under the U.S. DOD-imposed
Selective Availability Program.
Temp. Range: 5°F to 158°F (-15°C to 70°C)
Power
Performance
Receiver: Differential-ready 12 parallel channel WAAS capable
receiver
Acquisition Times:
Warm: Approx. 15 seconds
Cold: Approx. 45 seconds
AutoLocate: Approx. 2 minutes
Update Rate: 1/second, continuous
92
Source: 188: 8-35 V DC; 188C: 10-35V DC
Usage: 188: 4 watts max. at 13.8 vDC;
188C: 10 watts max. at 13.8vDC
Fuse: 188: AGC/3 AG-2.0 Amp; 188C: AGC/3 AG-5.0 Amp
Sonar
Sounder Power: 500 watts (RMS); 4000 watts (peak to peak)
Frequency: 50/200 kHz (45°/15°)
Depth: 1,500 foot max depth*
* Depth capacity is dependent on water salinity, bottom type and other water conditions.
GPSMAP 188/188C Sounder Owner’s Manual
APPENDIX > INSTALLING THE GPSMAP 188/188C SOUNDER
Installing the GPSMAP 188/188C Sounder
The GPSMAP 188/188C Sounder must be properly installed
according to the following instructions to get the best possible
performance. To complete the installation, you need the appropriate
fasteners and a 1" x 14-thread marine antenna mount available at
most marine dealers.
Mounting the GPS Antenna
The antenna should be mounted in a location that has a clear,
unobstructed view of the sky in all directions to ensure the best
reception. Avoid mounting the antenna where it is shaded by the
boat’s superstructure, a radome antenna, or mast. Sailboat users
should avoid mounting the antenna high on the mast to prevent
inaccurate speed readings caused by excessive heeling. Most
marine VHF and LORAN antennas should not seriously degrade
the GPS antenna’s reception. Never paint the antenna or clean it
with harsh solvents.
GPSMAP 188/188C Sounder Owner’s Manual
Suggested locations for mounting the external antenna.
The Garmin antenna screws directly onto any standard 1" x 14thread antenna mount. If you need to raise the antenna to avoid
shading, try using a 1" x 14-thread extension mast available at most
marine dealers.
NOTE: It is possible to route the
coaxial cable either through, or
outside the antenna mount. It
is possible to remove the BNC
connector on the coaxial cable
and the coaxial cable shortened
to ease installation, however,
doing so voids the antenna
warranty. If the BNC connector
is removed, it must be replaced
with a new solder-on or crimp
BNC connector.
93
APPENDIX > MOUNTING THE GPSMAP 188/188C SOUNDER
To install the GPS antenna:
1. Screw the antenna directly onto the 1" x 14-thread mount.
2. Route the cable to the mounting location of the display unit.
Use the appropriate tie-wraps, fasteners, and sealant to
secure the cable along the route and through any bulkhead
or deck.
3. After the GPSMAP 188/188C Sounder unit is installed,
connect the cable to the antenna connector on the back of
the display unit. Make sure that you turn the antenna cable
connector 1/4 turn clockwise to lock the cable into place.
Mounting the GPSMAP 188/188C Sounder
Using the Gimbal Mount
The GPSMAP 188/188C Sounder’s compact, waterproof case is
suitable for mounting in exposed locations or at the nav station.
The unit comes with a gimbal bracket that can be used for surface
or overhead mounting. When choosing a location for the display
unit, consider the following conditions:
• There should be at least a 3" (7 cm) clearance behind the
case to allow connection of the antenna and power/data
cables.
• The mounting surface should be heavy enough to support the
unit and protect it from excessive vibration and shock.
NOTE: The temperature range for the GPSMAP 188/188C
Sounder is 5°F to 158°F (-15°C to 70°C). Extended exposure
to temperatures exceeding this range (in storage or operating
conditions) can cause failure of the display. This type of
failure and related consequences are NOT covered by the
manufacturer’s limited warranty.
94
GPSMAP 188/188C Sounder Owner’s Manual
APPENDIX > MOUNTING THE GPSMAP 188/188C SOUNDER
5. Screw the two mounting knobs through the bracket and into
the display case.
6. Connect the power/data and antenna cables (external
antenna only) to the back of the unit, making sure the
locking rings are fully tightened on both connectors.
Flush Mounting the GPSMAP 188/188C Sounder
(GPSMAP 188C Shown)
To install the GPSMAP 188/188C Sounder:
The GPSMAP 188/188C Sounder can be flush mounted on a flat
panel. When flush mounting the GPSMAP 188/188C Sounder, be
sure to choose an appropriately sized location for the unit (see unit
dimensions on page 92) and leave 1.25" (32 mm) clearance below
the data card slot for inserting or removing data cards. Use the
Flush Mount Template provided in the package with the GPSMAP
188C. Use the instructions on the template to complete the flush
mount installation.
1. Select a location for the mounting bracket.
2. Mark and drill the four mounting holes for the fastener you
are using.
3. Fasten the bracket to the surface using the appropriate
fastener.
4. Insert the GPSMAP 188/188C Sounder into the mounting
bracket. The bracket is designed for a tight fit to provide
additional support when swiveling the unit.
GPSMAP 188/188C Sounder Owner’s Manual
95
APPENDIX > INSTALLING THE TRANSDUCER
Installing the Transducer
The transducer acts as the eyes and ears of your new sonar. Proper
transducer installation is critical to the operation of your unit. The
transducer transmits sound waves toward the bottom in a cone
shape. The larger the cone angle, the larger the coverage area at a
given depth.
Wide cone angle
A 50/200 kHz dual frequency 40°/10° cone angle, temperature
sensing, transom mount transducer is included in the
GPSMAP 188/188C Sounder (with transducer) package. This
transducer provides good all-around performance.
Narrow cone angle
dead zone
fish not seen
A wide cone angle transducer works best in shallow water. The
wide cone angle provides a large coverage area, but at a decreased
bottom resolution. In deeper water this can result in a large dead
zone where fish cannot be seen. A narrow cone angle transducer
is better suited to deep-water installations. The narrow cone angle
provides a smaller viewing area (compared to a wide cone angle
transducer at the same depth) with improved bottom resolution and
a smaller dead zone. Dual frequency transducers give you the best
of both wide and narrow cone angles.
X
X
96
GPSMAP 188/188C Sounder Owner’s Manual
APPENDIX > INSTALLING THE TRANSDUCER
Transom Mount Transducer
The following diagram is for mounting the transducer included with the GPSMAP 188/188C Sounder with transducer package. If the
transducer lead is too short, extension cables are available from your Garmin dealer. DO NOT cut the transducer lead or any part of the
transducer cable, as this will void your warranty. The cable cannot be spliced and connected to any existing (Garmin or non-Garmin)
transducer cables.
NOTE: DO NOT mount the transducer behind strakes, struts, fittings, water intake, or discharge ports, or anything that creates air bubbles or
causes the water to become turbulent. It is important that the transducer is in clean (non-turbulent) water for optimal performance.
Apply marine sealant to all�
screw threads to prevent water�
from seeping into the transom.
Mount the transducer cable cover�
well above the waterline.
Transducer should extend 1/8" below�
fiberglass hull or 3/8" below aluminum hull
OK
Make sure that the transducer is�
below water level when the boat �
is on plane at high speed
Do not mount transducer directly in the �
path of the prop. The transducer can cause�
cavitation that may degrade the boat's performance �
and damage the prop.
Mount the transducer parallel with the bottom.
GPSMAP 188/188C Sounder Owner’s Manual
97
APPENDIX > CONNECTING THE POWER/DATA CABLE
Connecting the Power/Data Cable
The power/data cable connects the GPSMAP 188/188C Sounder to a DC system and provides interface capabilities for connecting external
devices. The color code in the diagram below indicates the appropriate harness connections. Replacement fuse for the GPSMAP 188
AGC/3AG - 2 Amp fuse and a AGC/3AG - 5 Amp fuse for the GPSMAP 188C.
NOTE: During a typical installation, only the Red and Black wires are used. The other wires do not have to be connected for normal
operation of the unit.
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Pin 15
Pin 18
Pin 16
Pin 17
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PIN 16 (brown) NMEA IN (Com 1 RX)
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98
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PIN 13 (white) NMEA IN (Com 2 RX)
PIN 14 (green) NMEA OUT (Com 2 TX)
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PIN 11 (yellow) Alarm Low
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PIN 17 (blue) NMEA OUT (Com 1 TX)
PIN 18 (black) Ground
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GPSMAP 188/188C Sounder Owner’s Manual
APPENDIX > INTERFACING
Interfacing
The following formats are supported for connection of external
devices:
Garmin proprietary Differential GPS (DGPS), NMEA 0183
versions 3.0, ASCII Text Output, RTCM SC-104 input (vs. 2.0).
The following are the sentences for NMEA 0183, vs. 3.0 output:
Approved sentences—GPRMC, GPGGA, GPGSA, GPGSV,
GPGLL, GPBOD, GPRTE, and GPWPL.
Proprietary sentences—PGRME, PGRMZ, and PSLIB. The
GPSMAP 188/188C Sounder accepts NMEA input with support for
the DBT, DPT, MTW, and VHW sentences.
GPSMAP 188/188C Sounder Owner’s Manual
The GPSMAP 188/188C Sounder also includes NMEA input with
support for the WPL sentence and sonar NMEA input with support
for the DPT (Depth), MTW (Water Temp) and VHW (Water Speed
& Heading) sentences. If connecting to COM 2 for sonar NMEA
input, the unit interface must be set to NMEA In/NMEA Out. If
connecting to COM 1, the unit must be set to NMEA In/NMEA
Out.
You can download a copy of Garmin’s proprietary communication
protocol on the Support section of our Web site at
www.garmin.com.
Complete information regarding NMEA and RTCM formats is
available for purchase at www.nmea.org
99
APPENDIX > INSTALLING AND REMOVING DATA CARDS
Installing and Removing Data Cards
The GPSMAP 188/188C Sounder uses optional Garmin marine
BlueChart and MapSource data cards to display digital charts and
maps on-screen. Data cards are installed in the card slot located at
the bottom right of the unit. Data cards can be installed or removed
at any time, whether the unit is on or off.
To remove a data card:
1. Open the card door by pressing together on the two handles
at the bottom of the door and lifting it up and open.
2. Grasp the card handle at the bottom and pull down firmly.
3. If the unit is on, a confirmation tone sounds when the data
card is removed.
To install a data card:
1. Open the card door by pressing together on the two handles
at the bottom of the door and lifting it up and open.
2. Insert the card, with the label facing front and the handle
bottom, into the slot.
3. Firmly push the card into the unit. It in not necessary to
force the card and about 1/2" is still exposed when it is
properly inserted. If the unit is on, a confirmation tone
sounds and a message displays on-screen noting the card
details when the card is properly installed and accepted.
4. Close the cover.
If you insert a data card and get a “card format not recognized”
message, try removing the card and reinserting it. If the card is still
not recognized, contact Garmin Product Support or your Garmin
dealer for assistance. Data cards are not waterproof and should
not be exposed to moisture or excessive static charges. Data cards
should be stored in the case supplied with the card.
100
The first time you insert a data card, the unit takes a few seconds to
read the card.
After the data card is read, a summary screen appears. Press
ENTER to acknowledge.
GPSMAP 188/188C Sounder Owner’s Manual
APPENDIX > SATELLITE INFORMATION
Satellite Information
90°
Satellite Strength Indicator Bars
Center dot - 90°
above the horizon
Inner ring- 45°
above the horizon
Outer ring the horizon
45°
Satellite Sky View
Satellite Location
The location of each available satellite is displayed over two
location rings on the Satellite Information Page. The outer ring
represents the horizon, the inner ring represents 45° above the
horizon, and the center represents directly overhead. When the unit
is using a satellite for navigation, the satellite number is highlighted
on the location rings. The unit can be set to display satellite
location with North or your current track at the top of the display.
GPSMAP 188/188C Sounder Owner’s Manual
The Satellite Strength Indicator Bars show the strength of the
signal being received, and the status of the signal. The bars are
either shaded or filled. The gray bar means the GPS is in the
process of storing orbital data it is receiving from the satellite
signal. When the bar turns solid, the GPS is using the satellite
signal for navigation. A “D” in or above the bar means that
differential corrections (WAAS or DGPS) are being applied to that
satellite.
Date, Time, and Current Location
The GPS gets date and time information from the satellite’s onboard atomic clock. When the GPS receiver has achieved a 2D or
3D GPS location, the current location is displayed in the selected
location format.
101
APPENDIX > WHAT IS A WAAS AND DGPS?
What is WAAS?
The Wide Area Augmentation System (WAAS) is an F.A.A. funded
project to improve the overall integrity of the GPS signal. It is
a space-based system that broadcasts integrity information and
correction data as determined by ground reference stations. WAAS
testing completed in September of 2003 confirmed an accuracy of 2
to 3 vertical meters throughout the majority of the continental U.S.
and portions of Alaska. For more information, go to
http://gps.faa.gov/Programs/WAAS/waas.htm.
What is Differential GPS (DGPS)?
The U.S. and Canadian governments (among others) have set up
Differential GPS (DGPS) stations to transmit correction signals.
They are operational in coastal areas and on many navigable river
systems. The DGPS system is available for use without a fee.
Refer to the U.S. Coast Guard’s Web site, http://www.uscg.gov/
for locations and the status of the differential sites. Using DGPS
requires additional equipment.
NOTE: If you are using the GPSMAP 188/188C Sounder
outside of the U.S.A, we recommend you turn off WAAS for the
most accurate location fix.
102
GPSMAP 188/188C Sounder Owner’s Manual
APPENDIX > WHAT IS MMSI?
What is Maritime Mobile Service Identity
(MMSI)?
Maritime Mobile Service Identity (MMSI) basically allows a VHF
radio to act like a phone. In order to make a “call” on a phone,
you first need a phone number to dial. The 9 digit MMSI number
acts like a phone number when used in a Position Report and as a
unique identifier to the Coast Guard when used in an emergency
Distress Call. In order to obtain a Maritime Mobile Service Identity
(MMSI) number, users must register their VHF radio with the FCC
(Form 605). Garmin does not supply this number.
How are MMSI Assignments Obtained?
Non-commercial users (for example, recreational users who remain
in domestic waters and only carry VHF, EPIRB (Emergency
Position Indicating Radio Beacons), and Radar) are not required to
have a FCC ship station license. The FCC and Coast Guard have
authorized some second and third party vendors to assign MMSI
numbers. This service is limited to registering recreational vessels
only. To receive information on how to obtain a recreational MMSI
number, contact: http://www.uscg.mil/rescue21/links/mmsi.htm or
http://wireless.fcc.gov/marine/.
GPSMAP 188/188C Sounder Owner’s Manual
U.S Non-Federal User: Commercial users, or those who travel
outside the U.S. or Canada, must apply for a ship station license, or
an amendment to a ship station license. To find out if you require
a Ship Station license contact: http://wireless.fcc.gov/marine/
fctsht14.html. If your vessel requires licensing by the FCC you
obtain a MMSI during the application/licensing process when you
file FCC Forms 159 and 605.
U.S. Federal User: Federal users can obtain MMSI assignments
from their agency radio spectrum management office. These
procedures are currently under review by the NTIA (National
Telecommunications and Information Administration).
Outside the U.S.: Users can obtain an MMSI assignment from their
telecommunications authority or ship registry, often by obtaining or
amending their ship station license.
In Canada: Industry Canada is responsible for assigning MMSI
numbers to commercial and recreational vessels. Information is
available at the following web site: http://apollo.ic.gc.ca/english/
mmsi.html.
For information regarding MMSI’s visit:
http://www.uscg.gov/marcomms/gmdss/mmsi.htm.
103
APPENDIX > NAVIGATION TERMS
Navigation Terms
Avg Speed—the average of all second-by-second speed readings
since last reset.
Bearing (BRG)—the compass direction from your current location
to a destination.
ETA at Destination—the time you estimate to reach a Go To
destination or the final waypoint in a route.
ETA at Next—the time you estimate to reach a Go To destination
or the next waypoint in a route.
Course—the course between the active from and to waypoints.
Fuel—the fuel required to travel from current location to the
indicated route waypoint.
Depth—the depth below transducer. This field is active only if a
transducer is connected to the GPSMAP 188/188C Sounder.
GPS Accuracy—estimated accuracy of the GPS position.
Leg Dist—the distance between two route waypoints.
Distance (Dist)—the distance from the current location to a
destination.
Leg Fuel—the fuel required to travel from a route waypoint to the
next waypoint (in sequence) in the route.
Dist to Destination—the distance from the current location to a Go
To destination, or the final waypoint in a route.
Leg Time—the time required to travel from a route waypoint to the
next waypoint (in sequence) in the route.
Dist to Next—the distance from current location to a Go To
destination, or the next waypoint in a route.
Max Speed—the maximum second-by-second speed recorded
since last reset.
DOP (Dilution of Precision)—reflects the quality of the GPS
signals and satellite geometry.
Moving Average Speed—average speed while the unit is moving.
Elevation—height above mean sea level (MSL).
ETA (Estimate Time of Arrival)—The time you estimate to reach
your destination waypoint, based on current speed and track.
104
Moving Trip Timer—total time the unit has been moving.
Odometer—a running tally of distance travelled, based on the
distance between second-by-second position readings.
Off Course—the distance you are off course in either direction,
left or right.
GPSMAP 188/188C Sounder Owner’s Manual
APPENDIX > NAVIGATION TERMS
Pointer—an arrow pointing to your destination.
Speed—the current velocity at which you are travelling, relative to
a ground position. Also referred to as ground speed.
Sunrise—the current day’s time of sunrise.
Total Average Speed—average speed of unit for both moving and
stopped speeds since last timer reset.
Total Trip Timer—total time the unit has been in operation since
last reset of the trip timers.
Time Of Day—the current time.
Turn—the angle difference between the bearing to your destination
and your current track. “L” indicates you should turn left; “R”
indicates you should turn right.
Time To—the estimated time required to reach a Go To
destination, or the next waypoint in a route. Also known as
“estimated time en route.”
VMG (Velocity Made Good)—the speed you are closing in on a
destination along a course. Also referred to as the vector velocity to
your destination.
Time to Dest—the estimated time required to reach a Go To
destination, or the final waypoint in a route.
Voltage—current voltage reading being received by unit.
Sunset—the current day’s time of sunset.
Time to Next—the estimated time required to reach a Go To
destination, or the next waypoint in a route.
Water Speed—the speed through the water. This field is only
active if the GPSMAP 188/188C Sounder is receiving speed
readings from a NMEA device.
To Course—the recommended direction to steer to reduce course
error or stay on course. Provides the most efficient heading to get
back to the course and proceed along your route.
Water Temp—the water temperature. This field is only active if
the GPSMAP 188/188C Sounder is receiving speed readings from
a NMEA device.
Track—the direction of movement relative to a ground position.
Also referred to as “ground track.”
Waypoint Destination—the final waypoint in the route, or the
destination waypoint.
Trip Odometer—a running tally of distance travelled since last
reset. See also “Odometer.”
Waypoint Next—the next waypoint in the route.
GPSMAP 188/188C Sounder Owner’s Manual
105
APPENDIX > MESSAGES
Messages
No Diff GPS Location—RTCM is selected but no DGPS data is
being received.
Arriving at Destination—you are nearing your destination.
No Tide Stations for that Area—no tide stations within 100 miles
of the area.
Approaching Turn—you are nearing a turn in a route.
Batteries Low—you have less than 10 minutes of battery left.
Can’t Unlock Maps—no applicable unlock code for one or more
maps was found.
Cannot display all found, use city, or postal code—the unit
found too many items to display. Narrow the search using the city
or postal code.
None Found—no data matched the search criteria.
Off Course—you are off course the distance set in the “Off
Course” alarm.
Proximity Memory Full—no additional proximity waypoints can
be saved.
Database Error—internal problem with the unit. Contact your
dealer or Garmin Product Support to have the unit repaired.
Proximity Radius Overlaps—the radii of two proximity
waypoints overlap.
Deep Water—the water is deeper than the amount set in the Deep
Water Alarm.
Route Already Exists—you have entered a route name that
already exists.
Dragging Anchor—the distance set in the Anchor Alarm is
exceeded.
Route Memory Full—no additional routes can be saved.
Lost Satellite Reception—the unit is unable to continue receiving
satellite signals.
Memory Full—unit memory is full; no further data can be saved.
Near Proximity Point—you are nearing a proximity waypoint.
106
Route Truncated—uploaded route from another device has more
than 50 (188) or 254 (188C) waypoints.
Route Waypoint Memory Full—no additional route waypoints
can be saved.
Shallow Water—the water is shallower than the depth set in the
Shallow Water Alarm.
GPSMAP 188/188C Sounder Owner’s Manual
APPENDIX > MESSAGES
Track Already Exists—a saved track with the same name already
exists.
Track Truncated—a complete uploaded track does not fit in
memory. The oldest track log points have been deleted.
Track Memory Full—no more track data can be stored without
deleting old data.
Transfer Complete—data transfer has been completed.
Track Log Full—the track log is full and track recording has been
turned off. To record more track points, you need to clear the track
log and turn track recording on. This is only displayed when the
track recording setting is set to “Stop When Full.”
GPSMAP 188/188C Sounder Owner’s Manual
Waypoint Already Exists—a waypoint with the same name
already exists.
Waypoint Memory Full—the unit has stored the maximum
number of waypoints.
107
APPENDIX > LORAN TD SYSTEM
LORAN TD System
LORAN C is a radio navigation aid operated and maintained in the
United States by the United States Coast Guard. The name LORAN
is an acronym for “LOng RAnge Navigation.” The LORAN system
covers the entire United States and the U.S. Coastal Confluence
Zone. From the perspective of a mariner, the system is used for
ocean and coastal navigation. It can be used as a supplemental
system for harbor and harbor approach navigation, and it is used
for inland navigation by recreational vehicles.
LORAN TD Feature
The LORAN TD (Time Delay) feature eases the transition from
using LORAN to using GPS. The GPSMAP unit automatically
converts GPS coordinates to LORAN TDs for those who have a
collection of LORAN fixes for favorite fishing spots and other
waypoints recorded as TDs. You can display your position as a TD
or enter waypoints as TDs. The accuracy to be expected from this
conversion is approximately 30 meters. When the unit is placed
in the LORAN TD format mode, it simulates the operation of a
LORAN receiver. Position coordinates can be displayed as TDs,
and all navigation functions can be used as if the unit was actually
receiving LORAN signals.
Using the LORAN TD Format
Change to Loran TD from the Units
tab on the Main Menu.
108
When creating new waypoints using LORAN TD coordinates,
you must set the correct LORAN chain number and secondary
stations in the Setup TD field before storing the waypoint. After
the waypoint is stored in unit memory, it always references the
LORAN chain number and secondary stations currently selected in
the Setup TD field. If you enter a different LORAN chain number
or change the secondary stations or offsets in the Setup TD field,
the active waypoint information reflects those changes. Because
the GPSMAP 188/188C does not rely on the LORAN signal for
navigation, it can reference a different GRI chain and/or secondary
stations and still navigate to the location stored in memory.
GPSMAP 188/188C Sounder Owner’s Manual
APPENDIX > LORAN TD SYSTEM
The LORAN Position Format field is located on the Setup–
Location tab on the Main Menu. The LORAN TD Setup window
contains the fields to select the Loran GRI-Chain Number, Primary
and Secondary Stations, and TD Offsets.
To set up Loran TD from the Main Menu:
1. Press MENU twice to display the Main Menu.
2. Using the ROCKER, highlight the Position Format field on
the Units tab, and press ENTER.
3. Highlight Loran TD, and press ENTER.
4. Highlight Setup, and press ENTER.
5. To change the settings of any of the five fields, highlight the
field, and press ENTER. Select or enter a setting, and then
press ENTER.
6. When finished, highlight Save, and press ENTER.
If the active GRI Chain, secondary stations, or offsets were
changed since the waypoint was created, the waypoint now
references the active GRI-chain and secondary stations. You must
adjust the TD coordinates accordingly. Remember that the GPS
is not relying on the LORAN signal for navigation and actually
converts the TD coordinate to a useful LAT/LON coordinate before
storing the waypoint to memory or using it for navigation. Because
of this, the unit can navigate to a TD coordinate anywhere in the
world.
You must know your GRI chain number and secondary stations
to create a LORAN TD position. For more information, read
our LORAN TD Position Format Handbook, available from the
Garmin Web site (www.garmin.com/support/userManual.jsp.)
Loran TD Setup Page
GPSMAP 188/188C Sounder Owner’s Manual
109
APPENDIX > OPTIONAL ACCESSORIES
Optional Accessories
The following optional accessories are designed to enhance the
operation of the GPSMAP 188/188C Sounder.
To obtain replacement parts and optional accessories, contact your
Garmin Dealer, Garmin Product Support in the U.S.A. at
800-800-1020, or Garmin Europe at 44-0870-8501241.
Programmable Data Cards—blank data cards are available
in 8 MB, 16 MB, 32 MB, 64 MB, 128 MB, and 256 MB sizes.
Download street-level map detail, points of interest, business
addresses and phone numbers, marine data, topographical
information, and more from MapSource CD-ROMs to a data card,
either directly through your GPSMAP 188/188C Sounder using the
PC Interface Cable, or with the Data Card Programmer.
WARNING: Garmin accessories have been designed and
specifically tested for use with Garmin products. Accessories
offered by other manufacturers have not been tested or
approved for use with Garmin products. Use of such
accessories could cause damage to the GPSMAP 188/188C
Sounder and void the warranty.
USB Data Card Programmer—programs blank data cards at high
speed through a PC.
MapSource Software CD-ROMs—enhances the basemap,
create waypoints and routes from your PC. MapSource offers
several detailed mapping options that are compatible with the
GPSMAP 182/182C, including MetroGuide, Recreational Lakes
with Fishing Hot Spots, and Minnesota LakeMaster ProMap.
A/C Adapter—powers the unit using a standard AC house current.
110
Pre-Programmed Data Cards—data cards pre-programmed with
either Garmin BlueChart, Recreational Lakes with Fishing Hot
Spots or Minnesota LakeMaster ProMap chart/ data.
PC Interface Cable with vehicle Power Adapter—connects
the GPSMAP 188/188C Sounder to a vehicle’s electrical system
on one end, and a PC, beacon receiver, marine autopilot, or other
compatible device on the other end.
GPSMAP 188/188C Sounder Owner’s Manual
APPENDIX > SOFTWARE LICENSE AGREEMENT AND PRODUCT REGISTRATION
Software License Agreement
Product Registration
Garmin grants you a limited license to use the software embedded
in this device (the “Software”) in binary executable form in the
normal operation of the product. Title, ownership rights, and
intellectual property rights in and to the Software remain in
Garmin.
Use this area to record the serial number (8-digit number located on
the back of the box) in case your GPSMAP 188/188C Sounder unit
is lost, stolen, or needs service. Be sure to keep your original sales
receipt in a safe place or attach a photocopy inside the manual.
BY USING THE GPSMAP 188/188C SOUNDER, YOU AGREE
TO BE BOUND BY THE TERMS AND CONDITIONS OF THE
FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE
READ THIS AGREEMENT CAREFULLY.
You acknowledge that the Software is the property of Garmin and
is protected under the United States of America copyright laws
and international copyright treaties. You further acknowledge
that the structure, organization, and code of the Software are
valuable trade secrets of Garmin and that the Software in source
code form remains a valuable trade secret of Garmin. You agree
not to decompile, disassemble, modify, reverse assemble, reverse
engineer, or reduce to human readable form the Software or any
part thereof or create any derivative works based on the Software.
You agree not to export or re-export the Software to any country
in violation of the export control laws of the United States of
America.
GPSMAP 188/188C Sounder Owner’s Manual
Help us better support you by completing our online registration
today! Have the serial number of your GPSMAP 188/188C
Sounder handy and connect to our Web site (http://www.garmin.
com). Look for the Product Registration link on our Home page.
Serial Number: ___ ___ ___ ___ ___ ___ ___ ___
Contact Garmin
If you should encounter any difficulty while using your
GPSMAP 188/188C Sounder, or if you have any questions, in the
U.S.A. contact Garmin Product Support by phone: 913-397-8200
or 800-800-1020, Monday–Friday, 8 AM–5 PM Central Time, or
by e-mail at sales@garmin.com.
In Europe, contact Garmin (Europe) Ltd. at 44-0870.8501241.
111
APPENDIX > LIMITED WARRANTY
Limited Warranty
This Garmin product is warranted to be free from defects in materials or
workmanship for one year from the date of purchase. Within this period,
Garmin will at its sole option repair or replace any components that fail in
normal use. Such repairs or replacement will be made at no charge to the
customer for parts or labor, provided that the customer shall be responsible for
any transportation cost. This warranty does not cover failures due to abuse,
misuse, accident or unauthorized alteration or repairs.
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE
EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES EXPRESS
OR IMPLIED OR STATUTORY, INCLUDING ANY LIABILITY ARISING
UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE, STATUTORY OR OTHERWISE. THIS
WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY
VARY FROM STATE TO STATE.
IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL,
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER
RESULTING FROM THE USE, MISUSE, OR INABILITY TO USE THIS
PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some states do not
allow the exclusion of incidental or consequential damages, so the above
limitations may not apply to you.
Garmin retains the exclusive right to repair or replace the unit or software
or offer a full refund of the purchase price at its sole discretion. SUCH
REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR
ANY BREACH OF WARRANTY. To obtain warranty service, contact your
local Garmin authorized dealer or call Garmin Product Support for shipping
instructions and an RMA tracking number. The unit should be securely
112
packed with the tracking number clearly written on the outside of the package.
The unit should then be sent, freight charges prepaid, to any Garmin warranty
service station. A copy of the original sales receipt is required as the proof of
purchase for warranty repairs.
Garmin International, Inc.
1200 E 151st Street, Olathe, Kansas 66062 U.S.A.
Tel. 913/397.8200
Fax. 913/397.8282
Garmin (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9DL
U.K.
Tel. 44/0870.8501241
Fax 44/0870.8501251
Online Auction Purchases: Products sold through online auctions are not
eligible for rebates or other special offers from Garmin. Online auction
confirmations are not accepted for warranty verification. To obtain warranty
service, an original or copy of the sales receipt from the original retailer is
required. Garmin will not replace missing components from any package
purchased through an online auction.
International Purchases: A separate warranty is provided by international
distributors for units purchased outside the United States. This warranty is
provided by the local in-country distributor and this distributor provides
local service for your unit. Distributor warranties are only valid in the area of
intended distribution. Units purchased in the United States or Canada must
be returned to the Garmin service center in the United Kingdom, the United
States, Canada, or Taiwan for service.
GPSMAP 188/188C Sounder Owner’s Manual
APPENDIX > FCC COMPLIANCE
The Garmin GPSMAP 188/188C Sounder has no user-serviceable parts.
Should you ever encounter a problem with your unit, please take it to an
authorized Garmin dealer for repairs.
The GPSMAP 188/188C Sounder is fastened shut with screws. Any attempt to
open the case to change or modify the unit in any way will void your warranty
and may result in permanent damage to the equipment.
FCC Compliance
The GPSMAP 188/188C Sounder complies with Part 15 of the
FCC interference limits for Class B digital devices FOR HOME
OR OFFICE USE. These limits are designed to provide more
reasonable protection against harmful interference in a residential
installation, and are more stringent than “outdoor” requirements.
Operation of this device is subject to the following conditions: (1)
This device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that
may cause undesired operation.
This equipment generates, uses, and can radiate radio
frequency energy and may cause harmful interference to radio
communications if not installed and used in accordance with the
instructions. However, there is no guarantee that interference will
not occur in a particular
GPSMAP 188/188C Sounder Owner’s Manual
installation. If this equipment does cause harmful 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 of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the
receiver.
• Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician
for help.
The GPSMAP 188/188C Sounder does not contain any userserviceable parts. Repairs should only be made by an authorized
Garmin service center. Unauthorized repairs or modifications
could result in permanent damage to the equipment, and void your
warranty and your authority to operate this device under Part 15
regulations.
113
APPENDIX > SAFETY INFORMATION
Safety Information
MAP DATA INFORMATION: One of the goals of Garmin is to provide
customers with the most complete and accurate cartography that is available
to us at a reasonable cost. We use a combination of governmental and private
data sources, which we identify as required in product literature and copyright
messages displayed to the consumer. Virtually all data sources contain
inaccurate or incomplete data to some degree. This is particularly true outside
the United States, where complete and accurate digital data is either not
available or prohibitively expensive.
CAUTION: IT IS THE USER’S RESPONSIBILITY TO USE THIS
PRODUCT PRUDENTLY. THIS PRODUCT IS INTENDED TO BE USED
ONLY AS A NAVIGATIONAL AID AND MUST NOT BE USED FOR ANY
PURPOSE REQUIRING PRECISE MEASUREMENT OF DIRECTION,
DISTANCE, LOCATION OR TOPOGRAPHY. THIS PRODUCT SHOULD
NOT BE USED TO DETERMINE GROUND PROXIMITY FOR
AIRCRAFT NAVIGATION.
WARNING: The Global Positioning System (GPS) is operated by the
United States government, which is solely responsible for its accuracy
and maintenance. The system is subject to changes which could affect the
accuracy and performance of all GPS equipment. Although the Garmin
GPSMAP 188/188C Sounder is a precision electronic NAVigation AID
(NAVAID), any NAVAID can be misused or misinterpreted, and therefore
become unsafe.
CAUTION: Use the GPSMAP 188/188C Sounder at your own risk. To
reduce the risk of unsafe operation, carefully review and understand all
aspects of this Owner’s Manual—and thoroughly practice operation using
Simulator Mode prior to actual use. When in actual use, carefully compare
indications from the GPSMAP 188/188C Sounder to all available navigation
sources, including information from other NAVAIDs, visual sightings, charts,
etc. For safety, always resolve any discrepancies before continuing navigation.
CAUTION: The electronic chart is an aid to navigation and is designed to
facilitate the use of authorized government charts, not replace them. Only
official government charts and notices to mariners contain all information
needed for save navigation—and, as always, the user is responsible for their
prudent use.
114
WARNING: This product, its packaging, and its components contain
chemicals known to the State of California to cause cancer, birth defects,
or reproductive harm. This Notice is being provided in accordance with
California’s Proposition 65. If you have any questions or would like additional
information, please refer to our Web site at http://www.garmin.com/prop65.
GPSMAP 188/188C Sounder Owner’s Manual
INDEX
INDEX
Symbols
2D Differential 42
2D GPS Location 89, 101
3D Differential 42
3D GPS Location 101
A
Accessories 110
Accuracy 39
Accuracy Alarm 76
Accuracy Circle 67
Active Route Page 37
Options 38
Alarms
Accuracy 76
Anchor Drag 76
Arrival 76
Battery 76
Clock 76
DGPS 76
DSC 25
Fish 76
Off Course 76
Shallow/Deep Water 76
Temperature 76
Alarm Tab 76
Anchor Drag Alarm 76
Arrival Alarm 76
B
BackLight 4
Base Map 64
Battery Alarm 76
Bearing Line 67
Bottom Split 81
C
Card Tab 62
Celestial Tab 47
Cleaning iv
Clock Alarm 76
Color Mode 64
Communication Tab 72
Correction Signals 102
Course Line 67
Course Up 64
D
Data Cards 100
Data Entry 6
Data Fields
Change Numbers 31
Show 31
Split Fields 35
Date/Time 101
Daylight Saving Time 62
GPSMAP 188/188C Sounder Owner’s Manual
Delete
DSC Directory Item 24
Depth Line 82
DGPS 102
Alarm 76
Differential GPS 102
Dilution of Precision 104
Distance 60
Distress Calls 22, 22–25
DOP 104
DSC 22
Call List 24
Directory 24
Log 24
Setting Up 25
DSC Tab 61
E
Edit
Route 56
Waypoint 11
Enter/Mark Key 5, 8
F
FCC Compliance 113
Features 5
Find 19
Additional Information 21
Find Key 5, 19
Fish Alarm 76
Flasher 86
G
Gain 81
Garmin Data Transfer 72
Go To 13
Distress Call 25
Position Report 25
GPS Tab 39
Options 43
H
Heading Line 67
Highway Page 35
Options 36
Setup 37
Highway Tab 68
I
Initializing 1
Installation 93
Interface Keys 5
Interfacing 99
In Zoom Key 5
K
Keel Offset 87
Keypad Usage 5
Key Beeps 69
115
INDEX
L
Language 69
License Agreement 111
LORAN TD 108
M
Magnetic Variation 71
Main Menu 39
Main Pages 26
Man OverBoard 10
MapSource 62
Map Data Information 114
Map Datum 70
Map Detail 64
Map Information Page 65
Map Page 27
Options 30
Setup Map 33
Map Pointer 7, 28
Map Scales 29
Map Tab 64
Maritime Mobile Service Identity 103
Mark Key 5
Measure Distance 32
Menu Key 5
Merge From Card 62
Messages 106
MMSI 22, 103
MOB 10
MOB Key 5
116
N
NAV/MOB Key 5, 12
Navaids 66
Navigating 12
Distress Call 25
Go To 13
Position Report 25
Routes 53
TracBack 14
Navigation Terms 104
Nav Key 5
NMEA 74
Noise Reject 82
North Up 64
Numbers Page 34
O
Off Course Alarm 76
Orientation 64
Out Zoom Key 5
Overzoom 29
P
Pages Tab 63
Page Key 5
Pointer Page 33
Options 34
Points Tab 48
Position Format 70
Position Reports 23
Power Key 5
Power On/Off 1
Proximity Waypoints 52
Q
Quit Key 5
R
Receiving a DSC Call 25
Replace From Card 62
Review
DSC Call 23
Waypoints 11
Rocker Key 5
Routes 17
Copy 53
Create 17
Delete 53
Delete All 53
Edit 56
Routes Tab 53
Route Review Page 54
Options 55
RTCM 74
S
Safety Information 114
Satellite Location 101
Satellite Sky View 101
Selecting Options 6
Shallow/Deep Water Alarm 76
Simulator Mode 3, 114
Sonar 78
Depth Line 82
Gain 81
Noise Reject 82
Understanding 89
View/Span 81
Whiteline 82
Sonar Page 78
Adjustment Menu 79
Bottom Split 81
Options 83
Sonar Tab 68
Options 85
Specifications 92
Speed Filter 69
Spot Sounding 66
Storage iv
System Information 69
System Tab 69
T
Temperature Scale 68
Temperature Tab 68
Thermoclines 91
Tide Stations 43
Tide Tab 43
Time Format 62
Time Tab 62
Time Zone 62
GPSMAP 188/188C Sounder Owner’s Manual
INDEX
TracBack 14
Activate 16
Track Logs
Clear 15
Save 15
Track Tab 59
Active 59
Saved 59
Track Up 64
Transducer 90, 96
Trip Planning 58
Trip Tab 46
Move 12
Proximity 52
Reviewing 11
Underwater 84
Waypoint Lists
Proximity 51
User 49
Whiteline 82, 91
Wide Area Augmentation System 40,
102
Wiring Installation 98
U
Zoom Keys 5
Zoom Range 29
Zoom Settings 29
Underwater Waypoints 84
Units Tab 70
Unit Defaults 69
Z
W
WAAS 40, 102
Disable/Enable 41
Waterproof iv
Water Speed 87
Water Temperature Alarm 76
Waypoints
Creating 8
Creating Graphically 9
Editing 11
Enter/Mark 8
GPSMAP 188/188C Sounder Owner’s Manual
117
For the latest free software updates (excluding map data) throughout the life of your
Garmin products, visit the Garmin Web site at www.garmin.com.
© Copyright 2005 Garmin Ltd. or its subsidiaries
Garmin International, Inc.
1200 East 151st Street, Olathe, Kansas 66062, U.S.A.
Garmin (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9DL, U.K.
Garmin Corporation
No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan
www.garmin.com
Part Number 190-00585-00 Rev. A
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