Garmin GPSMAP 175 User manual

1
OWNER’S MANUAL AND REFERENCE
GPSMAPTM175
®
GOTO
ZOOM
MOB
MARK
QUIT
PAGE
MENU
EDIT
ENTER
175 Manual 7/31/98 3:55 PM Page 1

Software Version 2.0 or above
Internal Database Version 2.01 © Navionics Corporation
G-chart cartridge data is copyrighted by Navionics Corporation and may not be
copied or used for any other purpose without permission.
© 1996 GARMIN Corporation
1200 E. 151st Street, Olathe, KS 66062, USA
GARMIN (Europe) LTD
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ UK
All rights reserved. No part of this manual may be reproduced or transmitted
in any form or by any means, electronic or manual, including photocopying and
recording, for any purpose without the express written permission of GARMIN.
GARMIN, GPSMAP, G-chart, AutoLocate, TracBack, and PhaseTrac12 are
registered trademarks of GARMIN Corporation and may only be used with
permission. All rights are reserved.
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.
September 1996 Part #190-00096-00 Rev. A Printed in Taiwan.
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1
INTRODUCTION
Capabilities/Packing List
Congratulations on choosing one of the most advanced marine navigation
systems available! The GARMIN GPSMAP 175 uses the proven performance
and simple operation of GARMIN GPS in combination with powerful G-Chart
electronic charting for detailed cartography and plotting that will help guide
you in waterways around the world:
Precision Performance
• High-contrast LCD screen
• PhaseTrac12 receiver tracks and uses up to 12 satellites simultaneously for
fast, accurate positioning
• Differential-Ready— just add the optional GBR 21 beacon receiver for better
than 10 meter accuracy
• Fully-gasketed, dry nitrogen-filled case for use in exposed locations
Advanced Navigating and Plotting
• 250 alphanumeric waypoints with selectable icons and comments
• Built-in worldwide database usable from 4096 to 64 nm scales
• 20 reversible routes with up to 30 waypoints each
• G-chart electronic charting with inland and offshore coverage
• On-screen point-to-point distance and bearing calculations
• TracBack route feature which allows you to quickly retrace your track log to
a starting position
• Built-in simulator mode
Before installing and getting started with your unit, please check to see that
your package includes the following items. If any parts are missing, please see
your GARMIN dealer immediately.
Standard Package:
• GPSMAP 175 Unit
• Owner’s Manual
• Quick Reference Card
Optional Accessories:
• G-Chart Electronic Chart Cartridges
• External Antenna and 30’ Cable
• Power/Data Cable
• Mounting Bracket
• PCmate PC-Kit
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2
CAUTION
The GPS system 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 175 is a precision electronic NAVigation AID (NAVAID),
any NAVAID can be misused or misinterpreted and, therefore, become unsafe.
Use the GPSMAP 175 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 the simulator mode prior to actual use. When
in actual use, carefully compare indications from the GPSMAP 175 to all available
navigation sources, including the information from other NAVAIDs, visual
sightings, charts, etc. For safety, always resolve any discrepancies before
continuing navigation.
NOTE: This equipment generates, uses and can radiate radio frequency energy
and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee
that interference will not occur in a particular installation. If this equipment does
cause harmful interference, the user is encouraged to try to correct the interference
by relocating the equipment or connecting the equipment to a different circuit.
Consult an authorized dealer or other qualified technician for additional help if
these remedies do not correct the problem.
This device complies with part 15 of the FCC limits for class B digital devices.
Operation 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.
The GPSMAP 175 contains no user-serviceable parts. Repairs should only be
made by an authorized service center. Unauthorized repairs or modifications
could void your warranty and your authority to operate this device under Part 15
regulations.
ii
INTRODUCTION
Warning and Caution
WARNING!
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 the safety of navigation–and,
as always, the user is responsible for their prudent use.
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1
GETTING STARTED
Table of Contents
Capabilities/Packing List .................................................................i
Warning and Caution......................................................................ii
Table of Contents/Appendices .....................................................1-2
Unit Features ...................................................................................3
Keypad Usage ..................................................................................4
Initializing the Receiver/Getting Started ...................................5-22
Section 1: GPSMAP Status Page..............................................23-25
Satellite status page description, receiver status, and initialization options
Section 2: Position Page ..........................................................26-27
Position page description and uses
Section 3: Map Page.................................................................28-35
Map page description, modes, scales, and options
Section 4: Navigation Page ......................................................36-38
Navigation page description and options
Section 5: Main Menu Page...........................................................39
Viewing the main menu page and selecting submenus
Section 6: Waypoints ...............................................................40-48
Creating, using, and editing waypoints
Section 7: GOTO/MOB/TracBack Functions...........................49-52
Going to a destination and using GOTO options/TracBack routes
Section 8: Routes .....................................................................53-60
Creating, editing, and using routes
Section 9: Setup Menus ...........................................................61-70
System and navigation setup; timers, alarms, and track log
Section 10: Using G-chart cartridges ......................................71-72
Inserting, removing, and using electronic chart cartridges
1
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2
2
GETTING STARTED
Appendices
APPENDICES
Appendix A:
GPSMAP 175 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . .73-75
Appendix B:
Wiring & Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76-79
Appendix C:
Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80-81
Appendix D:
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Appendix E:
Time Offsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
Appendix F:
Map Datums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84-88
Appendix G:
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89-91
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1
GETTING STARTED
GOTO
ZOOM
MOB
MARK
QUIT
PAGE
MENU
EDIT
ENTER
3
Internal GPS
Antenna
Operating
Keypad
Three-level gray
LCD display
Battery Pack
(in back)
GPSMAP 175 Unit Features
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2
4
INTRODUCTION
Keypad Usage
M
P
J
G
O
T
Q
Z
R
B
Scrolls the main pages in sequence and returns
display from a submenu page to a main page.
Captures your present position and displays
the mark position window.
Returns display to a previous page or restores a
data field’s previous value.
Adjusts the map and highway scales up
and down.
Controls the movement of the cursor and is
used to select options and positions, and to
enter data.
Marks your present GPS position and instantly
sets a return course while providing steering
guidance.
Displays the GOTO waypoint window,
allowing you to select the destination
waypoint. Press GOTO twice to select a
destination waypoint graphically from the map.
Displays a context-sensitive options window.
Press MENU twice to display main menu page.
Activates highlighted fields and confirms menu
options and data entry.
Turns the unit on and off and controls 3-level
screen backlighting.
The GPSMAP 175’s advanced keypad system is designed to allow for fast, convenient
selection of navigation options and data entry.
The Getting Started Tour will introduce you to most of the keypad and provide a
“hands-on” lesson in using the GPSMAP 175. We strongly encourage you to take the
Getting Started tour before using your unit for actual navigation.
The GPSMAP 175 Quick Reference Card contains helpful tips on using the unit and
performing various navigation tasks. It’s a good idea to keep the Quick Reference Card
nearby whenever you’re navigating with your new GPS chartplotter.
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5
GETTING STARTED
Acquiring Satellite Signals
Acquiring Satellite Signals
Because the GPSMAP 175 relies on satellite signals to provide you with
navigation guidance, the receiver needs to have an unobstructed, clear view
of the sky for best performance. What exactly does this mean? In a nutshell,
the GPS receiver’s view of the sky will generally determine how fast you get
a position fix, or if you get a fix at all. GPS signals are relatively weak, and
do not travel through large obstructions made of metal, rock, or wood, for
example.
Once the GPS has calculated a position fix, you’ll usually have anywhere
from four to twelve satellites in view. Your GPSMAP 175 will now
continuously select the best satellites in view to update your position. If
some of the satellites in view get blocked or “shaded,” the receiver can
simply use an alternate satellite to maintain the position fix. Although a GPS
receiver needs four satellites to provide a 3D fix (latitude, longitude and
altitude), the GPSMAP 175 can maintain a 2D fix (latitude and longitude
only) with just three satellites.
Before You Initialize
Take your GPSMAP175 outside and find a large, open area (try a nearby
park) that has a clear view of the sky from horizon to horizon. Hold the
receiver at a comfortable height, at arm’s length from your body with the
built-in antenna (the top part above the display) parallel to the ground.
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2
INTRODUCTION
Initialization
Initializing Your GPSMAP 175 for First-Time Use
Your GPSMAP 175 calculates your position and movement by tracking
signals sent from GPS satellites. Each of the 24 GPS satellites circle the earth
twice a day in a very precise orbit, and transmit information back to earth.
In order to determine a position fix, your GPS receiver needs to
continuously “see” at least three satellites.
Because a GPS receiver can only see satellites above the horizon, it needs
to know what satellites to look for at any given time. By using an almanac
(a timetable of satellite numbers and their orbits) stored in the receiver’s
memory, the GPSMAP 175 can determine the distance and position of any
GPS satellite.
To use this almanac data, your GPSMAP 175 needs to know where you
are, or be given the opportunity to “find itself.” Once you initialize the unit
to this position, the GPSMAP 175 will usually compute a fix within a few
minutes.
Remember, this process is only necessary under the following conditions:
•First-time use from the factory;
•The receiver has been moved over 500 miles from the last calculated
position with power off; or
•The receiver’s memory has been cleared and all stored data has been lost.
6
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1
A. The welcome page
will be displayed
while the unit
performs a self-test.
B. Confirm the
Mariner’s Warning
before starting
navigation.
Remember that the
electronic chart is
designed as a
supplement to local government charts, not as a replacement.
7
GETTING STARTED
Initialization
The first time you power up your new GPSMAP 175 is an important step
in getting the best possible GPS performance. The receiver must be given an
opportunity to collect satellite data and establish its present position. To
ensure proper initialization, the GPSMAP 175 is shipped from the factory in
AutoLocate mode, which will allow the receiver to ‘find itself’ anywhere in the
world. To speed up the initialization process, we recommend using the
graphic initialization process described below, which will usually provide a
position fix in about a minute.
Before you initialize, make sure the GPSMAP 175 unit and antenna have
been correctly installed on your vessel according to the instructions in
Appendix A and B.
To turn the GPSMAP 175 on:
1. Press and hold the Pkey until the power tone sounds.
The welcome page will appear while the unit conducts a self test. Once the
internal test is complete, the mariner’s warning will appear, asking you to read
and acknowledge important information regarding the proper use of
electronic charts.
To acknowledge the mariner’s warning:
1. Press the Tkey.
A message alert and prompt will also appear to ask you to select an
initialization method.
To view a system message:
1. Press the Jkey.
2. Press the Jkey again to return to the previous page.
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A. Use the arrow
keypad to move the
cursor to a location
close to your
present position.
B. Hollow signal
strength bars will
appear on the
status page while
the receiver collects
satellite data.
8
GETTING STARTED
Initialization
The select initialization window will appear, with the ‘select from map’
option highlighted.
1. Press Tto initialize the receiver from the built-in worldwide map.
The map page will appear, prompting you to select your approximate
present position with the map cursor.
1. Use the Rkeypad to move the map cursor to a location close to your present
position. If you have difficulty identifying your exact position, use the bottom
arrow of the
Z key to zoom in to a lower map scale.
2. Press Tto confirm your selection.
The GPSMAP 175 will now begin searching for the appropriate satellites
for your present position and should acquire a fix within a minute or so.
While the receiver searches for satellites, a flashing satellite icon will appear at
the left-hand side of the status bar. A signal strength bar will also appear for
each satellite in view, with the appropriate satellite number under each bar.
The progress of satellite acquisition is shown in three stages:
• 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 has collected the necessary
data and the satellite(s) is ready for use.
Once the receiver has collected information from at least three satellites, the
flashing satellite icon on the status bar will glow steadily, and the GPSMAP
175 is ready for use.
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A. The screen contrast
may be adjusted
from the
status page by
pressing the
ARROW KEYPAD.
Press EDIT/ENTER
to confirm changes.
B. Whenever the screen
backlighting is on, a
bulb icon will appear in the status bar at the bottom of every GPSMAP 175 page.
9
The GARMIN GPSMAP 175 is a powerful electronic
charting/navigating system that provides detailed chart coverage and
convenient control of many advanced features right from the map display.
This tour is designed to take you through the basic pages and functions
of the system using the simulator mode. Once you’re familiar with the
main pages and functions of the unit, refer to the reference section for
instructions on performing specific tasks and functions.
The Getting Started tour assumes that the receiver has been properly
installed and initialized, and you have not changed any of the default unit
settings. If you have changed any settings (position formats, units of measure,
etc.), the descriptions and pictures in the tour may not match your configuration.
To turn the GPSMAP 175 on:
1. Press and hold the Pkey until the power tone sounds. The welcome page
will appear while the unit conducts a self test.
2. Once the self test is complete, press the Tkey to acknowledge the
mariner’s warning.
The satellite status page will appear, and the receiver will begin to acquire
satellites. From the status page, you may also quickly adjust the screen
contrast and backlighting.
To adjust the screen contrast:
1. Increase the screen contrast by pressing the right arrow of the Rkeypad.
2. Decrease the screen contrast by pressing the left arrow of the Rkeypad.
3. Press the Tkey to finish.
The GPSMAP 175’s three-level screen backlighting is controlled with the
Pkey, and may be adjusted at any time from any page.
To turn on and adjust the backlighting:
1. Press the Pkey repeatedly until backlighting is at the desired level
(off, 1, 2, or 3).
GETTING STARTED
Power On/Screen Contrast
175 Manual 7/31/98 3:55 PM Page 9

A. To start the simulator, confirm the simulator
warning. Simulator mode should never be used for
actual navigation.
B. Whenever Simulator
mode is activated, a
‘Setup Simulator?’ and
an ‘Exit Simulator?’
option will appear on
the options page.
GETTING STARTED
Status Page/Simulator Mode
10
The GPSMAP 175’s status page provides a visual reference of satellite
acquisition and receiver status, with a signal strength bar graph and a satellite
sky view in the center of the page. Each page of the GPSMAP 175’s system also
features an options page, which gives you access to other functions and
features that relate to the specific page you are viewing. To get a feel for how
the options pages work, lets put the GPSMAP 175 into simulator mode.
To place the GPSMAP 175 in simulator mode:
1. From the status page, press the Okey. The options page will appear,
displaying a menu of options and functions for the status page.
2. Use the UP or DOWN arrow of the Rkeypad to highlight the ‘Start
Simulator?’ option and press T.
3. Press the Tkey to confirm the simulator warning.
Once the simulator has been started, the status field at the top of the page
will display a ‘Simulating Navigation’ status, and you’re ready to continue the
rest of the tour. Keep in mind that the GPSMAP 175 does not track satellites
in simulator mode, and should never be used for actual navigation. However,
all the waypoint and route planning done in simulator mode is retained in
memory and can be used during normal operation.
Status Field
Horizontal Accuracy Satellite
Sky View
Signal Strength
Indicators
Status Bar
Dilution of Precision
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1
The satellite status page is one of four main pages used in the GPSMAP 175’s
system. All four pages are linked together in a simple chain, which allows you
to scroll through the pages in either direction using the Jand Qkeys. To
continue the tour, let’s move on to the next page, the position page.
To scroll to the next page in sequence:
1. Press the Jkey.
The GPSMAP 175’s position page shows where you are, what direction
you’re heading and how fast you’re going. The compass at the top of the page
indicates your cardinal heading while you’re moving. The four user-selectable
data fields below the compass tape show your current course and speed over
ground, along with a resettable trip odometer and altitude display. Your
current latitude and longitude, along with a 12/24-hour clock, appear at the
bottom of the page.
Now that you’ve seen how the status and position pages can be used to
monitor satellite acquisition and your present position, let’s take a minute to
learn how to mark and store our present position as a waypoint. (Since we’re
in simulator mode, the present position displayed will be the last position
calculated by the receiver, which should be the spot where you’ve initialized
the unit.) This will also give you an opportunity to see how the GPSMAP 175’s
Rkeypad and Tkey are used for data entry.
11
GETTING STARTED
Page Sequence/Position Page
Compass
Tape
Data
Fields
Position
Coordinates
Time
of Day
Status Bar
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A. The mark position
page will
automatically assign
a default three-digit
name for each
waypoint, which can
be changed to a six-
character
alphanumeric name
at any time.
B. A complete set of waypoint symbols allows you to mark inland and offshore waypoints
with a custom icon for fast waypoint recognition.
GETTING STARTED
Marking A Position
12
1. Press the Mkey. The mark position page will appear, with a default
three-digit waypoint name and symbol.
2. Use the Rkeypad to highlight the waypoint name field (001) and press T.
3. Press the LEFT ARROW of the Rkeypad to clear the name field.
4. Use the Rkeypad to enter the name ‘DOCK’, using the UP and DOWN
arrows to select each letter, and the RIGHT arrow key to advance to the
next character position. If you make a mistake and select an incorrect
character, simply use the LEFT arrow key of the Rkeypad to backspace
the cursor and correct the entry.
5. Press Tto confirm the name.
6. The field highlight will advance to the symbol field. Press Tto access
the waypoint symbol page.
7. Use the Rkeypad to highlight the ANCHOR symbol.
8. Press Tto confirm the symbol.
9. Press Tagain to confirm the ‘DONE?’ prompt and save the waypoint.
The waypoint is now stored in memory. Note that waypoints may also be
created graphically from the map display and by manually entering position
coordinates. Both of these techniques are described in the reference section of
the manual and/or on your GPSMAP 175 Quick Reference Guide. To continue
our tour, let’s move on to the map page.
1. Press the Jkey.
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1
A. Select an on-screen
waypoint by moving
the cursor onto the
waypoint. The name
and position, along
with the bearing and
distance from your
present position, will
be displayed.
B. The map page can
also be configured to display additional data fields and a graphic course deviation
scale or compass. See page 32 for more on map options.
13
GETTING STARTED
Map Page
The GPSMAP 175’s map page combines digital chartplotting with a user-
selectable display of navigation data and a built-in worldwide database to 64
nautical miles (nm). It will also be the page you use most to create and edit
waypoints and routes. Before we take off on our practice route, let’s take a brief
look at its various features and displays.
The map display, located in the middle of the page, shows your boat as a
triangle marker on an electronically generated chart, along with geographic
names, markers and buoys that are provided by the G-chart cartridge you’re
currently using. It also displays your track, routes and nearby waypoints. An
on-screen cursor lets you “pan” or move the view on the screen to see other
areas, determine the range and bearing to a position, and perform various
waypoint and route functions.
The data window, located at the top of the page, provides a user-
selectable display of various navigation data, including course, speed over
ground, and the bearing and distance to the cursor or a particular waypoint.
The status bar, located at the bottom of the page, displays the current map
scale setting, as well as the status information described on page 23.
Boat
Icon
Data
Fields
Map
Scale
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2
A. Whenever the
cursor is active, the
bearing and
distance of the
cursor from your
present position will
appear in a pop-up
data window.
B. To remove the
cursor and recenter
your vessel on the map, press the QUIT key.
14
GETTING STARTED
Using the Map Cursor
Working from the map page is a simple process that centers around the use
of the cursor. Controlled by the Rkeypad, the cursor is an important tool that
can be used to pan to other map locations, mark and edit waypoints and
routes, and review position data of on-screen navaids and waypoints.
To get a feel for using the map page and using the cursor, try the
following exercise:
1. Use the DOWN arrow of the Z key to set the map scale to the 64 nm setting.
Your boat should be in the center of the map, at the receiver’s last known
position. (If your boat isn’t where it should be, make sure that you
have
initialized the receiver and acquired a position as described on pages 6-8.
2. Use the DOWN arrow of the Rkeypad to move the cursor down to the
first lat/lon grid south of your boat’s position.
3. Using the Rkeypad to move the cursor, try following the outline of the
lat/lon grid closest to your boat. Notice how another data field appears at
the top of the page, showing the bearing and distance from your boat to
the cursor, along with the lat/lon of the cursor.
4. Press the Q key to remove the cursor and recenter your boat on the map display.
As you become more familiar with the cursor, you’ll see that the map
display actively scrolls or ‘pans’, letting you explore areas around the world
(even outside of your current G-chart coverage) and create waypoints and
routes. Wherever you move the cursor, you’ll always be just one Q
keystroke away from returning the map to your present position.
Now that you have a feel for how the cursor works, let’s move on and see
how the GPSMAP 175 works on the water. To help you practice using the
map page and other features, we’ve stored a practice route in the receiver’s
permanent memory, so you can see exactly what you’ll experience when
you’re navigating with your new GPS chartplotter.
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1
A. Pressing GOTO
once displays a list
of all waypoints
stored in memory.
To pick a
destination, select
the desired
waypoint and press
EDIT/ENTER.
B. The GOTO options
page allows you to either start a TracBack route back home, select a destination
from the nearest waypoints list, or select a route to navigate.
15
GETTING STARTED
Using the GOTO Key
GPS is all about marking positions as waypoints and navigating to them
using the receiver’s steering guidance and map displays. We’ve already seen
how to use the Mkey to store our present position, so it’s time to move on
to the fun part: going to a destination. The Gkey, located on the left side of
the keypad above the Qkey, is the primary tool used to select a destination
waypoint or a route to navigate. The Gkey can be used in three ways:
• Pressing Gonce displays a list of all waypoints in memory, from which
you can select a single destination waypoint.
• Pressing Gfollowed by the Okey provides a list of GOTO options
that lets you start a TracBack route, select a destination waypoint from the
nearest waypoints list, select a stored route to navigate, or cancel the
current GOTO destination.
• Pressing Gtwice allows you to graphically select an on-screen
waypoint, navaid or cursor position as a destination directly from the
map display.
For our simulated trip, we’re going to select the preprogrammed tour route
(the second method), which will automatically place our vessel at the first route
waypoint. This will also give us an idea of how the Okey is used throughout
the GPSMAP 175 system to provide options automatically oriented toward the
function currently in use. Let’s give it a try by activating the practice route stored
in memory for navigation:
1. Press G. The waypoint list page will appear. (If we were selecting a
single waypoint to navigate to rather than a route, we would highlight the
waypoint and press T.
2. Press Oto display the context-sensitive options available for the GOTO function.
3. Use the Rkeypad to highlight the ‘Select Route?’ option. Press Tto confirm.
4. The select route page will appear, with the ‘GPSMAP TOUR’ route highlighted.
5. Press T. The map page will reappear and display five waypoints chained
together in a simple route, with your boat at the first route waypoint.
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2
A. To enter a boat
speed or define the
simulated course,
highlight the ‘Setup
Simulator?’ option
and press
EDIT/ENTER.
B. Enter a boat speed of
60 knots to begin the
tour. This will allow
you to complete the Getting Started tour in 10-15 minutes.
GETTING STARTED
Simulator Setup/Map Scales
16
A data field at the top of the page will now display the bearing and distance
to the second route waypoint. To continue, let’s enter a speed for our vessel,
which we can do from the ‘Setup Simulator?’ listing on the options page. The
setup simulator page is also available from any other page in the main page
sequence.
To enter a boat speed:
1. Press the Okey to display the map options page.
2. Use the Rkeypad to select the ‘Setup Simulator?’ option, and press T.
3. Once the setup simulator page appears, press Tto access the SOG field
(Speed Over Ground).
4. Use the Rkeypad to enter a speed of 60 knots.
5. Press Tto finish, and Jto return to the map display.
Once a speed has been entered, you’ll notice that the map will begin to move
slowly, keeping your boat centered on the display. To get a better view of what’s
going on, zoom in to a closer map scale.
1. Press the DOWN arrow of the Rkey to select the 16 nm scale.
You’ll now have a clearer picture of the route we are navigating, along with an
outline-only presentation of the surrounding shoreline. Because the usable range
of the built-in database is only valid to 64 nm scale, we no longer have full
cartography available. Keep in mind that whenever you do exceed the usable
range of the built-in database or the G-chart cartridge in use, the range field will
display ‘OVR ZM’ or ‘NO MAP’ to indicate that you should exercise extreme
caution using the cartography data. (See pages 31 and 72 for more information
on map scales and using G-chart detailed cartography.)
Now that we’re zoomed in a little closer to our route, we can pan ahead of our
vessel with the cursor to review and create on-screen waypoints and navaids. Try
moving the cursor to select the ‘TOUR3’ waypoint— just use the Rkeypad to
move the cursor as close as possible to the waypoint. (To move the cursor in
small increments, try a series of short key presses.)
175 Manual 7/31/98 3:56 PM Page 16