Magellan NAV 5000 User Manual

MAGELLAN GPS

NAV 5000

TM

USER GUIDE

Magellan Systems Corporation

960 Overland Court

San Dimas, California 91773

[phone]

FAX [phone]

No part of this User Guide may be reproduced or transmitted in any
form or by any means, electronic or mechanical, including photocopy­ing and recording, for any purpose other than the purchaser's personal
use, without the written permission of Magellan Systems Corporation.

© Copyright Magellan Systems Corporation, 1991. All rights reserved.

MagellanTM, GPS NAV 5000TM , and InstafixTM are the trademarks of
Magellan Systems Corporation.

Part No. 22-10029-000

WARNINGS

A measure of knowledge by the user is required for proper and safe
use of the
WARRANTY COMPLETELY.

This product is an excellent navigation aid, but it does not replace the
need for careful orienteering and good judgement. Never rely solely
on

one device for navigating.

The Global Positioning System (GPS) is operated by the U.S. Govern­ment, which is solely responsible for the accuracy and the mainte­nance of GPS. Certain conditions can make the system less accurate,
such as changes in the orbit or health of a satellite.

Accuracy can also be affected by poor satellite geometry. WHEN THE
ACCURACY WARNING APPEARS ON THE SCREEN, USE THIS
DATA WITH EXTREME CAUTION.

Magellan GPS NAV 5000TM.

READ THE USER GUIDE &

Use Good Judgment

Use Care to Avoid Inaccuracies

THE GLOBAL POSITIONING SYSTEM IS STILL DEVELOPMENTAL.
The government can make changes to the system which could affect
the performance of GPS receivers. Such a change could require a
modification to your NAV 5000.

tion/Warranty card to Magellan, you will have the opportunity to
upgrade your unit and/or software.

lf you have returned the Registra-

Throughout this User Guide, the pattern graphic/graphic/text is used to
explain and describe the key sequences used to operate the unit.
Specifically, the keys pressed are shown, followed by the screen as it
appears after the keys are pressed. The text repeats the instructions
that were described graphically.

Reading the Guide

NOTE:

li

mits for a Class B digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equip­ment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off
on, the user is encouraged to try to correct the interference by one or
more of the following measures:

—
—
—Connect the equipment into an outlet on a circuit different from that

—

This equipment has been tested and found to comply with the

and

Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.

to which the receiver is connected.

Consult the dealer or an experienced radio/TV technician for help

.

TABLE OF CONTENTS

CHAPTER 1

The NAV 5000

The GPS System

Data Transmission
How a Position Fix is Obtained
I

nterference

Monitoring and Controlling GPS

Specifications

Packing List

Accessories

Carrying Case
Quick-Release Bracket Mounting Kit

...............................................................................

........................................................................... 1-2

.................................................................

.............................................................................

................................................................................

...................................................................................

...................................................................................

........................................................................

CHAPTER 2

-

-

GETTING READY TO USE

YOUR NAV 5000

Batteries

........................................................................................

Loading Alkaline Batteries
Battery Operation
Battery Warning

...................................................................

.....................................................................

..................................................... 2-1

INTRODUCTION

1-1

1-2

.............................................. 1-2

1-3

............................................

..................................... 1-8

1-3

1-5

1-7

1-7
1-8

2-1

2-3
2-3

External Power Operation

Power Adapters
Connecting to an External Power Source

Initialization

Orienting the Antenna

Collecting an Almanac

Connecting to an External Device (NMEA)

NMEA Pin Positions

....................................................................................

............................................................

..................................................................... 2-4

..................................................................

.................................................................. 2-10

..................................

...............................................................

i

..............................

2-3

2-4

2-5

2-9

2-13
2-13

NMEA Setup
Activating NMEA Support

..........................................................................

......................................................

2-14
2-14

Entering Data

...............................................................................

CHAPTER 3 - BASIC OPERATION

Obtaining a Position Fix

Entering a Waypoint

Saving a Position
Entering a Position Manually

Setting a Route

Getting Velocity

Getting Navigation Data

Determining the Quality of a Fix

Signal Quality
Geometric Quality
Dated Information

Adjusting Display Brightness

Obtaining Information on the Satellites

Satellite Status
Satellite Schedule

.............................................................................. 3-5

.............................................................................. 3-7

............................................................... 3-1

....................................................................... 3-3

...................................................................

................................................. 3-4

.................................................................

................................................... 3-9

......................................................................... 3-9

...................................................................

......................................................................

........................................................

.......................................................................

...................................................................

......................................

2-14

3-3

3-7

3-9

3-10

3-10

3-11

3-11

3-12

Supporting NMEA Devices

...........................................................

CHAPTER 4 - FUNCTION KEYS

Last Fix

Light

Navigation

..........................................................................................

The Last Fix
Last Fix Backups

...............................................................................................

...........................................................................

....................................................................

.....................................................................................

ii

3-13

4-1
4-1
4-2

4-4

4-4

On/Off

............................................................................................

Self-Test
Power Warnings

4-7

.................................................................................. 4-8

.....................................................................

4-8

Position (POS)

Taking a Position Fix
Position Display
Continuous Operation
Real - Time Messages
Search and Acquisition Errors
Insufficient Number of Satellites
Unit Searches Constantly
Initialization Error
Accuracy Warning Symbol
Signal Quality
Old Data

Route

.............................................................................................

Multi-Leg Routes and NMEA
Creating a Route
Viewing an Existing Route
Resetting a Route
Route Modes
Automatic Mode
Manual Mode

SETUP

Entering an Initialization Position
Setup Worksheet
Selecting Mode and Altitude
Setting the Time
Choosing Automatic or Manual Route Mode
Choosing Lat/Lon Display
Selecting a Defined Map Datum
Setting a User-Entered Map Datum
Magnetic Variation Display
Distance/Speed Units
Altitude Units
Date Order

...............................................................................

.............................................................. 4-10

..................................................................... 4-12

............................................................

...........................................................

............................................... 4-15

............................................

......................................................

...................................................................

..................................................... 4-17

......................................................................... 4-17

..................................................................................

.................................................

....................................................................

.....................................................

..................................................................

..........................................................................

.....................................................................

..........................................................................

..........................................................................................

...........................................

...................................................................

.................................................. 4-30

..................................................................... 4-32

.........................

...................................................... 4-34

............................................

.......................................

.................................................... 4-38

............................................................ 4-39

..........................................................................

..............................................................................

4-10

4-14
4-14

4-15
4-15

4-16

4-18

4-18

4-19

4-20

4-22

4-22
4-22
4-24
4-25

4-26

4 27

4-28

4-33

4-35

4-36

4-40
4-41

Velocity

..........................................................................................

iii

4-41

Waypoints

......................................................................................

Saving Positions as Waypoints

Entering Waypoints Manually
Viewing Stored Waypoints
Renaming Waypoints
Clearing a Waypoint

CHAPTER 5

.............................................................

...............................................................

AUXILIARY FUNCTION KEYS

-

..............................................

................................................

.....................................................

4-42
4-42

4-44
4-46
4-47
4-48

AUX 1 — Receiver Status Screen
AUX 2 — Display Control

AUX 3 — Satellite Status

.......................................................

.......................................................

AUX 4 — Satellite Schedule
AUX 5 — Sky Search
AUX 6 — NMEA Setup
AUX 7 — Beeper Control

.............................................................

..........................................................

.......................................................

AUX 8 — Waypoint Projection
AUX 9 — Battery Saver

.........................................................

AUX 10 — Erase Waypoints
AUX 13 — Clear Memory

......................................................

.........................................

..................................................

...............................................

..................................................

Table of Auxiliary Functions, in Alphabetical Order

CHAPTER 6

TROUBLESHOOTING AND

-

OPERATING TIPS

Error and Warning Messages

Operating Problems

Display Frozen

No Power

.....................................................................

.......................................................................

...............................................................................

Unit Turns Off During Use
Position Fix Doesn't Change
Fixes Vary a Lot

.....................................................................

External Devices Not Responding
Autopilot Does Not Respond
Nav Does Not Work
Dashes Appear in NAV Displays
Zeroes Appear in POS, NAV, and VEL Displays.
Satellite Availability Not To Your Expectations

.......................................................

......................................................

.................................................

........................................

.................................................

...............................................................

..........................................

.....................

...............

.................

5-2
5-3
5-3
5-6
5-8
5-9
5-10

5-11
5-12
5-13
5-14
5-16

6-1

6-5
6-5
6-5
6-6
6-6

6-7
6-8
6-8
6-9
6-9
6-9
6-9

Operating Tips

General

..................................................................................

..............................................................................

iv

6-11
6-11

Unsure of Your Initialization Position

.....................................

6-11

Choosing a Datum

Using the Unit Near the Poles

Storing the Unit

For More Than 3 Months
For Less Than 3 Months

When Nothing Else Works

Magellan Customer Support

........................................................................

......................................................

..............................................................................

.......................................................

........................................................

...........................................................

.........................................................

APPENDICES

Appendix 1 — Waypoint Log
Appendix 2 — Table of Constants
Appendix 3 — Geometric Quality
Appendix 4 — Signal Quality
Appendix 5 — Function Key Sequences
Appendix 6 — Glossary

........................................................

................................................

.................................................

........................................................

......................................

................................................................

INDEX

6-11

6-12

6-12
6-12
6-13

6-13

6-13

A-1
A-3
A-13
A-14
A-15
A-19

v

CHAPTER 1

INTRODUCTION

This chapter contains a description of the NAV 5000, its specifications
and accessories, and the Global Positioning System (GPS).

THE NAV 5000

The NAV 5000 is an affordable, hand-held GPS receiver that is fast,
powerful, and accurate, yet very easy to use. The NAV 5000 uses five
channels working simultaneously to locate and collect data from the
GPS satellites. The unit's gallium arsenide circuitry rapidly processes
data received from the satellites to compute current location (LAT/
LON), altitude, and velocity and navigation data in under 1 minute, and
updates the data every second.

The NAV 5000 can be set to use any of three modes to calculate
positions: two-dimensional (2D), three-dimensional (3D), and the
Automatic (AUTO) Mode. In 2D, the unit uses 3 satellites to calculate
latitude and longitude: altitude is a user-entered variable. In 3D, the
unit uses 4 satellites to calculate latitude, longitude, and altitude. In the
Automatic Mode, the unit uses 3D whenever 4 satellites are available;
when only 3 satellites are available, the unit switches to 2D.

the

The NAV 5000 also stores an initial position, last fix, the four
recent fixes, and up to 100 waypoints that are created by the user.
Most of these positions can be used to enter a route and to estimate
the coordinates and bearing of a distant location.

The NAV 5000 was developed primarily for marine use. lt supports
most devices that conform to NMEA (National Marine Electronic
Association) standards 0180 or 0183. This includes devices such as
autopilots, plotters, and sounders.

Though a fast, powerful navigation tool, the NAV 5000 is very easy to
use. Most functions can be accessed by pressing only one clearly
marked key. Other functions, such as the NMEA control and Sat
Status, are accessed through the auxiliary keys.

most

1-1

THE GPS SYSTEM

The Global Positioning System (GPS) is a highly accurate, worldwide
navigation and positioning system that can be used 24 hours a day.
Designed at the impetus of the US Department of Defense and prima
ly for military use, GPS is available to a variety of users worldwide,
including recreational boaters, fishing and shipping fleets
commercial aviation, surveyors, and engineers.

The system is based on a constellation of satellites that, when com­plete, will consist of 21 satellites and 3 working spares orbiting the
Earth twice a day in six orbital planes. Each satellite is in a fixed orbit
approximately 10,900 nautical miles above the Earth, and inclined at
55 degrees from the equator.

Data Transmission

Each satellite continuously transmits two types of orbit data: Almanac

and Ephemeris. Almanac data contains the health and approximate

location of every satellite in the system. Ephemeris data contains the

precise orbital parameters of each satellite. A GPS receiver gathers

Almanac data from any available satellite; using information from the

Almanac, the receiver then determines which set of satellites will give

the best geometries for a position fix.

The satellites also transmit two codes. The encrypted code (P-Code) is
the more accurate of the two, and is reserved for military use.

, general and

ri-

The unprotected code (Coarse Acquisition, or C/A Code) is intended
for public access. lt is also used to determine the precise range of the
user from each satellite, which is the first step in calculating a position
fix.

All transmissions from the satellites are in real time.

How a Position Fix is Obtained

Navigation with the Global Positioning System and a well-designed

GPS receiver is very simple. The receiver uses data collected from

three or four satellites to solve a fundamental geometric equation and

presents it in navigation displays.

First, the unit determines which satellites to use to obtain the position
fix and then the receiver obtains Ephemeris data from those satellites.
(Three satellites are used in 2D; a fourth satellite is used in 3D to
determine altitude.)

1-2

THE GLOBAL POSITIONING SYSTEM

The receiver then assesses the transmission time and signal quality
from each satellite, and multiplies the difference in the transmission
time by the speed of light (186,000 miles per second) to arrive at an
estimate of the satellite's distance from the receiver (range). Next, the
unit calculates (by triangulation) and displays the position fix.

Although accuracy varies slightly with satellite constellation geometry,
a position fix accuracy of 25 meters or better is typical with C/A Code
receivers.

Interference

GPS uses a high frequency radio signal (1575.42 MHz) that operates
in a wave environment where there is little interfering radiation. Also,
GPS uses spread spectrum technology to protect its navigation sig­nals. The GPS signal is therefore extremely resistant to conditions that
disturb other electronic navigation systems. In general, weather
conditions, on-board electronics, passing ships, on-shore electronic
installations, on-board engine ignition, and portable radio receivers do
not affect the GPS signal.

Monitoring and Controlling GPS

GPS is operated by the US Air Force from a master control station in
Colorado, USA. The facility is equipped for satellite monitoring, telem­etry, tracking, command and control, data uploading, and navigation
message generation.

1-3

Monitor stations and ground antennas throughout the world passively
track the GPS satellites and relay data to the master control station.
Exact satellite position and signal-data accuracy can therefore be
constantly updated and maintained. Minor discrepancies between
where the satellite "thinks" it is and where the monitor station "knows" it
is can also be adjusted.

lf any satellite emits erroneous data or is otherwise not operating
properly, a ground station marks it "unhealthy." The affected satellite
broadcasts its status to the GPS receiver, which is programmed to
ignore an unhealthy satellite and use the next best satellite to obtain a
position fix.

The master control station can selectively degrade satellite data. This
degradation, or Selective Availability (SA), can cause positioning errors
of 100 meters (2D RMS).

DISPLAY
SCREEN

ANTENNA

FUNCTION
KEYS

ALPHANUMERIC
KEYPAD

GPS RECEIVER

1-4

SPECIFICATIONS

Physical Characteristics

Unit Size:

3.5" x 8.75" x 2.13" (excluding antenna);
(13.8 cm x 34.5 cm x 8.4 cm)

5.0" x 9.0" x 2.5" (bracket-mounted)
(19.7 cm x 35.4 cm x 9.8 cm)

Weight:

Display:

LCD Dimension:

LCD Operating
Temperature:

Case:

Buoyancy:

Safe Storage
Temperature:

GPS Exterior Antenna:

30 ounces (.85 kg) with batteries

4 line, 16 character, alphanumeric, backlit
LCD

2.56" x 1.77" (6.5 cm x 4.5 cm)

0.28" (0.70 cm) high digits (w/cursor)

-10°C to 60°C

Waterproof (Battery Compartment is

splashproof.)

Specific Gravity compared to seawater =

0.8 (it floats)

-40°C to 70°C

3.5" (8.89 cm) diameter x 3.5" (8.89 cm)
height, plus 50 feet (15.24 meters) of

cable. (Part of Quick-Release Bracket

Mounting Kit.)

Data Characteristics

Accuracy:

Position — 15 meters RMS in 2D. (Accu­racy of fixes can be affected by the

periodic adjustments to GPS satellites by

the US Government, and is subject to
change in accordance with the Depart­ment of Defense Civil GPS user policy.)
Velocity —±0.1 Knots (HDOP<2,

>47 dB-Hz, 2D)

C/N

o

1-5

Velocity:

0 to 825 Knots (0 to 951 mph)

Time to First Fix:

Update Rate:

Memory:

Modes of Operation:

Electrical Characteristics

Power Requirements:

55 seconds typical (cold start)

35 seconds typical (warm start)

1 second (2D) typical

100 user-stored waypoints, initial position,

and 5 last fixes

2D (solves for LAT, LON, and time with a

user-entered altitude using best 3 satel

OR

3D (solves for LAT, LON, Attitude, and

me using best 4 satellites)

ti

OR

Automatic (uses 2D or 3D, depending on
number of available satellites.

6 AA alkaline batteries (internal), 10 to 15

DC with adapter

v o l t s

lites)

Power Consumption:

115 volts

160 mA without backlight

185 mA with backlight

AC±10%, with adapter

1-6

PACKING LIST

When you receive your NAV 5000 Basic Package, you should have all

the following:

o

Magellan Nav 5000 unit, 1
Battery Clips, 2 —1 in unit and 1 spare

o

Batteries, 6 — in unit

o

Lanyard, 1

o

o

Field Card, 1

o

User Guide, 1

o

Warranty/Registration Card, 1

o

Faststart

lf any of these items is missing, contact your dealer.

NAV

of

5000

MAGELLAN GPS NAV 5000

ACCESSORIES

The NAV 5000 has several accessories, including spare battery clips
and power adapters. The two most commonly used accessories are
described below. All accessories for the NAV 5000 are available from
your Magellan dealer.

1-7

Carrying Case

The sturdy carrying case, illustrated below, holds the unit, an extra
clip, and the field card. The case can be worn over the shoulder
belt, and is an excellent storage container when the unit is

NAV 5000 CARRYING CASE

or on your

not in use.

Quick-Release Bracket Mounting Kit
The Quick-Release Bracket Mounting Kit allows you to operate the

5000 inside a wheelhouse or cabin by attaching the NAV 5000 to
external antenna. The kit includes:

battery

NAV

an

Unit Holder

o

GPS Antenna Coupler

o
o

U-Bracket, with mounting hardware

o

Exterior Antenna with 50 feet of cable

o

DC/Antenna Interface Box

o

Installation Instructions

The components of this kit are also available separately.

1-8

CHAPTER 2

Getting Ready to Use the NAV 5000

Before your NAV 5000 is ready for use, there are several setup tasks
that must be completed. This chapter describes these tasks in the
order in which they should be performed.

BATTERIES

The NAV 5000 requires six (6) AA alkaline batteries for operation. The
batteries are used to operate the unit without an external power
source. (See Battery Saver on page 5-12.)

Magellan Systems Corporation recommends Eveready Energizer
batteries.

We do not recommend that you operate the NAV 5000 with nickel
cadmium (NiCad) batteries. NiCads have a much shorter life than
alkaline batteries; in the NAV 5000, they last only about 3.5 hours.
Also, the power drop at the end of NiCad battery life is so rapid that
there may be no warning before the unit's memory is lost. Use NiCad
batteries at your own risk.

The NAV 5000 is shipped with alkaline batteries already installed.

Loading the Alkaline Batteries

The unit must be operated with six (6) AA alkaline batteries. Use the
procedure below to load batteries.

Put the batteries in the extra battery clip. Be sure the batteries

1.
are oriented as shown on the clip.

2 Be sure the unit is off.

If the unit was being operated on external power, also discon-

3.
nect the NAV 5000 from the external power source.

TM

2-1

Holding the unit as shown in the illustration below, pull the

4.
battery cover firmly towards the bottom of the unit until it

stops, then lift the door off. To create a seal against moisture,
the cover fits snugly, and will not move easily.

Remove the old battery clip. Insert the new clip in the battery

5.

compartment; it will fit only with the open side facing you and
the clip's external contacts on the right.

OPENING THE BATTERY COVER

Remove any dirt, sand, or other foreign matter from the battery

6.
compartment seal.

Replace the battery cover. Position the cover over the battery

7.
clip and push up firmly until the door settles into place. Be sure

the door is secure.

2-2

Battery Operation

When operated from battery power, the unit operates continuously
once POS, NAV, or VEL has been pressed, updating the position fix
every second. The unit remains on until it is turned off with the ON/
OFF button or the batteries wear out. Continuous Operation is a very
heavy drain on the batteries; you can expect about 10 hours' use from
alkaline batteries in continuous operation.

The unit has a Battery Saver feature, which allows you to reduce the
drain on the batteries. When the Battery Saver is on and POS is
pressed, the unit takes position fixes for two minutes. lf no other keys
are pressed, the unit then shuts itself off.

Refer to page 5-12 to turn the Battery Saver on.

Battery Warning

There are two battery
warnings. The first is a
symbol that appears when
the batteries are low
symbol remains on all
displays until the batteries
are replaced.

. This

If the Battery Saver is off, when the first battery warning appears, the

unit is able to operate continuously for up to 30 minutes. lf the Battery
Saver is on, you can turn the unit on and obtain position fixes 15 more
ti

mes.

The second warning is
added when the batteries

become dangerously low.
lf the batteries are not
replaced, information
stored in the unit's memory
may be lost.

EXTERNAL POWER OPERATION

The NAV 5000 can be operated from an external AC or DC power
supply. When being run on external power, the unit operates continu­ously until the unit is turned off (with the ON/OFF button) or external
power is lost.

2-3

lt should be noted that when the unit is being operated from external

power, the batteries are

batteries recharged in the unit.

Use only Magellan equipment to connect the unit to an external power
source. All Magellan adapters and interfaces have been designed to
supply the unit with the correct level of DC voltage; the use of any
other equipment may harm the unit and void the warranty.

bypassed.

At no time are alkaline or NiCad

Power Adapters

The unit is connected to an external power source with one of several
Magellan adapters. Discuss your needs with your Magellan dealer to
be sure you purchase the correct adapter.

Currently, AC adapters are available for 110 volts, 220 volts, and 240
volts. There is also a regulated 12-volt DC adapter.

ConnectIng to an External Power Source

Refer to the drawing below to connect the unit to an external power

source.

POWER CONNECTIONS FOR THE NAV 5000

2-4

The external power jack is located on the right side of the unit,
opposite the antenna. Insert the five-pin connector of the adapter into
the power jack.

This message appears
when the level of external
power being supplied to
the unit is below minimum
requirements. The unit is
operating on battery
power.

INITIALIZATION

The NAV 5000 responds more quickly when used within 300 miles
(482.7 km) of its initialized position or last fix.

To initialize, you must know your location (latitude and longitude) within
300 miles (482.7 km). You should also know your altitude as accu­rately as possible. (Note that normal tidal fluctuations do not affect this
measurement.) lt you do not know your position, call your local marine
electronics dealer, or consult an atlas or chart.

Although you can obtain a position fix without entering an initial posi­tion, the unit obtains the first position fix more quickly if a correct initial
position was entered. lt is also possible to operate without having
entered an altitude, but this will affect the accuracy of the position
fixes, especially in 2D operation. Therefore, regardless of which mode
you plan to use, an altitude should be entered. When a 2D position fix
is obtained, the value entered will be used as the default altitude, and
will allow the unit to obtain more accurate fixes. If you will be using the
Automatic Mode, an altitude should be entered for the initial position
because the unit may use either 3D or 2D to obtain fixes.

If no altitude is entered, the unit assumes that altitude is 0.

2-5

lt is also possible to initialize by using the Sky Search (AUX 5) function
to establish your position automatically. This method takes about 15
minutes. lt should be noted that the unit gets the first position fix more
quickly when an initial position is entered manually. (See page 5-8.)

Press the SETUP key. If a
position is already entered,
press the CLEAR key to
erase it.

2-6

Enter your approximate
position within 300 miles
(latitude and longitude).
For example, to enter a
latitude of 34°00.00N, key
in 3, 4, and ENTER.
zeroes are
automatically. (lf
prefer, enter all zeroes
manually.) Use the RIGHT
ARROW to toggle between

entered

Trailing

you

N and S, if necessary.
Press ENTER.

Enter the longitude by
pressing the numbers on
the keypad. Use the
RIGHT ARROW to toggle
between E and W. Press
ENTER.

From the initial position
screen, press the DOWN
ARROW to go to the
mode/altitude display.
Press the RIGHT ARROW
to choose 2D, 3D, or
AUTO Modes.

Remember that in 2D the unit calculates latitude and longitude only,
and altitude is a user-entered value. In 2D, the unit is able to calculate
more accurate position fixes when an altitude is entered at the mode/
altitude display than is possible without a user-entered altitude. (Op­eration in the 2D Mode is recommended for marine use.) In 3D,
altitude is calculated by the unit. In the Automatic Mode, the unit uses
3D when 4 satellites are visible and 2D when only 3 satellites are
visible.

2-7

Press CLEAR to erase the
old altitude. Key in the new
altitude. (Use the RIGHT

ARROW to toggle between

positive and negative

values.) Press ENTER to

store the altitude.

lf you will be using the unit

in 3D, press the RIGHT

ARROW to change to 3D.

Note that an altitude is also

displayed here. If you want

to, you can change it as

described above.

If you will be using the unit
in the Automatic Mode,
press the RIGHT ARROW
change to AUTO. Press
CLEAR to enter a new
altitude as described

above.

to

Press any function key to exit SETUP.

2-8

ORIENTING THE ANTENNA

In order to obtain a position fix or collect an Almanac, the unit must be
held or placed in direct view of the satellites overhead. Hold the unit
upright or rotate the antenna up as shown in the figure below.

GIVE THE ANTENNA A DIRECT VIEW OF SATELLITES

The unit will not receive signals if its view of the satellites is blocked by
objects or people, or if you attempt to use it inside without an external
antenna.

2-9

OBSTRUCTIONS BLOCK THE SIGNALS

For

ease and comfort of operation, a holder is available for the unit,

which can be mounted to the boat.

COLLECTING AN ALMANAC

The Almanac is a schedule of satellite availability stored in the NAV
5000's memory. This means that before you obtain a position fix, the
unit already knows which satellites are scheduled to be in view (given
your last position or initialized position) and where in the sky to look for
them.

Almanac information is maintained by all satellites, and is updated as

required by GPS system operators to reflect current conditions. Alma

nac information can be collected from any satellite. The NAV 5000

refreshes its Almanac each time POS, NAV, or VEL is pressed.

Therefore, when the unit is in frequent use, it maintains a current

Almanac.

When the unit has not been used recently (generally, nine months or

more), its Almanac may be out of date. The unit can still obtain a

2-10

-

position fix, however. When POS is pressed the unit will locate a
satellite and update its Almanac before calculating a fix. The unit also
collects an Almanac when POS is pressed and it does not have an
Almanac. (See page 4-10).

lf you need to collect a new Almanac, be aware that it takes about
12-1/2 minutes to collect a complete Almanac once a satellite signal
has been located. (Be sure you have a clear view of the sky.) Since the
receiver is on while the Almanac is being collected, this can be a heavy
drain on your batteries. You might want to connect the unit to extemal
power to collect an Almanac.

lf the unit has lost its memory, it must be reinitialized and a new
Almanac collected. There are several ways to do this. One is to
initialize the unit as described on page 2-5 and collect an Almanac with
AUX 5 (see page 5-8).

You can also press POS. The unit will locate a satellite, collect an

Almanac, and calculate a position fix.

2-11

Press POS. The unit tries
to determine which satellite
is scheduled to be over­head.

Since there is no Almanac
or initial position, the unit
enters Sky Search. The
receiver searches for
satellites in a prescribed
pattern until one is located.

The ALM COLLECT
message appears on the
display when a satellite
has been located and
acquired, and the unit is
collecting an Almanac.

When the unit has located
and acquired three satel­lites, it calculates a 2D
position fix. Altitude is
assumed to be 0; the fix
may therefore not be
accurate unless you are at
sea level.

The unit then checks the
Almanac to be sure that it
is both complete and
accurate do not turn the
unit off, and maintain a
clear view of the sky until
this message disappears.

Since all non-default SETUP parameters were lost when memory was
lost, you must reenter them. Be sure to reenter your altitude or antenna
altitude also.

You can also reinitialize the unit and collect an Almanac by pressing
AUX 5. The unit will locate a satellite, collect an Almanac, and calcu­late an initial position.

Press AUX, 5, and EN­TER.

2-12

Press ENTER again to
initiate Sky Search. The
receiver searches for
satellites in a prescribed
pattern until one is located.

The ALM COLLECT
appears on the
when a satellite
has been located and
acquired, and the unit is
collecting an Almanac. DO
NOT turn the unit off until
this message disappears.

lt takes approximately 12-1/2 minutes to locate a satellite and collect
an Almanac. If the signal is interrupted during Sky Search, however,
the unit requires more time to locate a satellite and collect an Almanac.
We recommend that you collect an Almanac before getting under way.

message

display

CONNECTING TO AN EXTERNAL DEVICE (NMEA)

The NAV 5000 can interface with various autopilots, plotters, sounders,
and radars through its National Marine Electronics Association (NMEA)
interface. The NAV 5000 supports NMEA standards 0180 and 0183.

The jack on the side of the NAV 5000 provides a connection for both
external power and for NMEA support. The optional Power/NMEA Data
Cable has three receptacles on one end. One receptacle is for the
5-pin AC adapter. Another is an RCA jack for the old-style power
adapters. The third receptacle is to connect to the NMEA device of
your choice. (See illustration on page 2-4.)

NMEA Pin Positlons

To connect the NAV 5000 to NMEA 0180 or 0183 devices you will
have to purchase a 9-pin connector (male DB-9) to mate with the
Power/NMEA Data Cable. They are readily available at any electronics
or marine electronics store. The wires should be soldered into the pins
shown on page 2-14.

2-13

9-PIN CONNECTOR

NMEA Setup

To prepare the unit to support an NMEA device, press AUX 6. Follow
the message prompts to activate the dataport and select the output
message that is required by your equipment. (See page 5-9.)

Activating NMEA Support

The unit supports NMEA devices only when it is in continuous opera­tion (Battery Saver off or using external power), the dataport is on,
output has been activated by pressing POS, NAV, or VEL, and position
fixes are being obtained.

Do not turn the external device on until you are sure the unit is
emitting
fix (usually

Successful NMEA support of external devices requires that the follow­ing parameters be set:

data. Data is emitted only after the unit has obtained its first

within 1 minute), and is then updated every 2 seconds.

o

cables are connected

o

unit is ON

o

route is set

o

unit is operating with Battery Saver off or from extemal power

o

dataport is on and set to a message output acceptable to your

device

o

external device is turned on

o

unit is getting position fixes

ENTERING DATA

Information must be entered into the unit from the alphanumeric

keypad to enter an initial position, to manually enter a waypoint, or to

2-14

name or retrieve a waypoint.
Look at the keypad. lt is arranged in the same way as your telephone

keypad (reverse 10-key). Each key is assigned to a number and two or
three letters.

To enter a position (either as an initial position or to enter a waypoint
manually), simply press the appropriate alphanumeric keys until the
entire coordinate is entered, then press ENTER.

If you pressed the wrong key, press CLEAR and choose another.

34

Key in the coordinate,
using the RIGHT ARROW
to toggle between hemi-

spheres. Press ENTER.
Trailing zeroes are added

by the unit automatically.

Waypoint names are entered by pressing an alphanumeric key, then
pressing the RIGHT ARROW until the desired character appears on
screen.

To enter a letter, press the
key on which the letter
appears. The first letter
assigned to that key
on the display.

appears

the

2-15

Toggle through the key
assignments with the
ARROW. (The
order for the
G, H, I, 4, G,
ENTER when
want is

assignment

key shown is

H....) Press

the letter you

displayed.

RIGHT

CHAPTER 3

BASIC OPERATION

This chapter contains a brief description of the NAV 5000 features you

will

use most often. lt is not intended to describe any feature fully or to

describe all of the unit's features or options.

To fully understand the NAV 5000 and what it can do, you must read
Chapters 4 and 5.

This chapter briefly describes how to:

o

obtain a position fix

o

enter waypoints

o

set a route

o

obtain navigation data

o

get velocity

o

determine the quality of a position fix

o

adjust display brightness

o

get more information on the satellites

o

support an NMEA device

If you have not already done so, initialize your unit as described in
Chapter 2, Initialization.

OBTAINING A POSITION FIX

How to obtain a position fix is described fully starting with page 4-10.
(Be sure you have a clear view of the sky.)

When the unit is first
turned on, it displays its

power source for a few

seconds.

3-1

When the display shows
this message, the unit is
ready to operate.

Press POS. The unit starts
the InstafixTM satellite
search algorithm. Instafix

TM

devotes all five channels to
the search for the satellite
directly overhead, given
your last fix or initial
position.

Once that satellite is
located the unit acquires

Ephemeris data from it and
begins to search for other
satellites that should be in
view. The unit also selects
the satellites that will give
the best geometry for a fix.

When enough satellites to take a position fix have been found and

acquired, the unit computes a position fix. When the unit has been set
to 2D operation, this occurs when 3 satellites have been acquired. In
3D operation, the fix is made when 4 satellites have been acquired. In
Automatic, the unit operates in 3D if 4 satellites are available, and 2D
when only 3 satellites are available. The first fix is usually obtained in
about 55 seconds.

The position fix is shown
on three display screens.
The first screen displays
the latitude, longitude,
altitude, and mode. In 2D

altitude is a user-entered
value; altitude is computed

in 3D.

3-2

Press the DOWN ARROW
to view the current datum
and the date and time the
fix was taken.

Press the DOWN ARROW
again to view which
satellites were used to take
the fix, the signal quality
from each satellite, and the
geometric quality of the fix.

Press the DOWN ARROW again to return to the first display.

ENTERING A WAYPOINT

A waypoint is a position that is stored in the unit's memory. Once
stored, the position can then be used for navigation. The NAV 5000
can store up to 100 waypoints.

Waypoints can be entered by storing a position fix as a waypoint, or by
entering it manually.

Saving a Position

When you want to save a position as a waypoint, first display the
position on the screen. Display your current position with POS, the last
fix with LAST FIX, or a backup fix with LAST FIX and the RIGHT
ARROW.

When the desired position
is displayed, press EN­TER. The cursor appears
in the upper left corner of
the display.

3-3

Entering a Position Manually

Waypoints can also be entered manually.

Key in a one- to six­character waypoint name,
using the alphanumeric
keys as described on page
2-14, then press ENTER.

Press ENTER twice for the
NAV 5000 to name the
waypoint automatically.

The name will be in the
format WPTxxx, where xxx
is 001 through 099, in
sequence.

Press WPT.

3-4

Press ENTER.

Key in the name you want

to use for this Waypoint

and press ENTER, or

press ENTER twice to

name the Waypoint
automatically.

Key in the latitude. Use the
RIGHT ARROW to toggle
between North and South.
Press ENTER.

Key in the longitude. Use
the RIGHT ARROW to
toggle between East and

West. Press ENTER. The
default altitude is dis­played.

Press ENTER to accept

the default altitude, or key

in a new altitude. Use the

RIGHT ARROW to toggle

to a negative altitude

(below sea level). Press

ENTER.

Refer to page 4-42 for more information an waypoints.

SETTING A ROUTE

To navigate between two places, create a route that uses two
waypoints as the start and destination. You can divide your route into
two to ten legs.

Press ROUTE. The current

leg of an existing route is

displayed. This route must

be cleared before

continuing.

3-5

Press CLEAR twice. The
unit automatically displays
the most recent position
fix.

Press the RIGHT ARROW
scroll through the
until the position
to use as start is

If you prefer, press the first letter of the waypoint and ENTER, and
begin scrolling from there.

Press ENTER to accept
the displayed waypoint as
the starting point. The
cursor immediately goes to
the destination field. If
"POS" was selected, it is
renamed "start."

Choose a waypoint as the
destination by pressing the
RIGHT ARROW until the
desired position is dis­played. (Only POS and
waypoints are available as
destinations.)

waypoints

you want

displayed.

to

3-6

Press ENTER to continue
and set the next leg.
Repeat the steps above to
enter a start and
destination for each leg.

When all of the legs have

been entered, press

ENTER twice. The display

returns to the first leg.

For more detail, refer to Route in Chapter 4, starting at page 4-18.

GETTING VELOCITY

Velocity information is available only in continuous operation, and only

when your speed exceeds 0.2 knots.

Press VEL to obtain speed
and ground course
information.

For more detail, refer to page 4-41.

GETTING NAVIGATION DATA

The unit can obtain navigation data only when a route has been set.
Navigation data available includes Bearing, Distance to destination,
Steering, Time To Go, and Cross Track Error data.

Press NAV to navigate to
your first destination. NAV
data is shown an four
display screens. The first
shows Bearing, Distance to
destination waypoint,

3-7

Cross Track Error, whether

you are to the right or left
of your route leg, and
which leg you are on.

Press the DOWN ARROW
see Steering.

Press the DOWN ARROW
again to see Estimated
Time of Arrival (ETA) and
Velocity Made Good
(VMG).

Press the DOWN ARROW

to see Time To Go (TTG)
and Speed Of Advance
(SOA).

When you are within 500

feet of your destination, the
NAV 5000 beeps and
displays the message
"CLOSE."

to

Refer to page 4-4 for further information.

3-8

DETERMINING THE QUALITY OF THE FIX

The quality of the fix is affected by the strength of the signals being
received from the satellites and the geometry of the satellite set used
to obtain the fix.

Signal Quality

The Signal quality (SQ) is an indication of the carrier-to-noise ratio of

the signal being received from a satellite. lt is displayed on the receiver

status screen and on the last screen of the position display.

Signal quality ranges from 0 to 9, with 9 being the best. When SQ is 4
greater, the signal is strong enough that the unit will not lose its lock
SQ can sometimes be improved by moving the antenna; even a
can improve SQ greatly.

The signal quality has almost no bearing on accuracy. lt is provided to
you to a condition that may affect the unit's ability to maintain a
the satellites currently being used.

When this symbol appears
on the bottom right of the
display, the signal quality
of one or more satellites
used for the fix is 3 or less.

or

on it.

few inches

alert

lock on

Geometric Quality

Geometric quality is a measurement of the geometry of the satellites
used to triangulate the position. The further apart the satellites are, the
better the geometry of the fix. Geometric quality ranges from 0 to 9,
with 9 being best. When the GQ is 7 or better, the geometry should
not

affect accuracy.

3-9

When this symbol appears
on the display, the geom­etry of the fix is 3 or less.
The accuracy of this fix is
extremely poor, and it
should not be used for
navigation.

Dated Information

If the unit loses a satellite signal and no other satellite is available, the
cannot update the position fix. The NAV 5000 displays the most
position fix with an hourglass symbol in the lower right corner.

This symbol appears when
the unit is displaying old
information. The fix dis­played is not current, and
should not be used for
navigation.

unit

recent

ADJUSTING DISPLAY BRIGHTNESS

The display on the NAV 5000 can be backlit by pressing LIGHT on the
function keypad. The display remains lit until LIGHT is pressed again
until the unit is turned off.

The brightness of the display when the light is on can also be adjusted.

or

3-10

Press AUX, 2 and ENTER.
the light is not already
on, also press LIGHT.

Press the RIGHT ARROW
adjust the brightness.
Adjustment levels range
from 1 to 15.

If

to

OBTAINING INFORMATION ON THE SATELLITES

Some information on the satellites is available in the position displays.
More information can be obtained with the Satellite Status and the
Satellite Schedule functions.

Satellite Status
Satellite Status contains information on a satellites's health and current

status, and displays the elevation and azimuth of satellites that are
above the horizon.

Press AUX, 3, and
ENTER.

Press the RIGHT ARROW
to select any saved
position.

3-11

Press ENTER. The current
date and time is displayed.
You may enter another
date and time, if you want.

Press ENTER. The display
shows information about
the first satellite. Press the
RIGHT ARROW to toggle
between on and off for this
satellite. Press the DOWN
ARROW to go to the next
satellite. There is a value
for SQ when the satellite

displayed was used in a
recent position fix.

Refer to page 5-3 for more detail.

Satellite Schedule

Until the global positioning system is complete, you may not be able to
use the unit 24 hours a day in all locations. The Satellite Schedule
computes the windows in which enough satellites will be available to
take a position fix, given the location and date you enter, and the
current mode (2D or 3D).

Press AUX, 4, and

Press the RIGHT ARROW
to choose a position. You
may choose from last fix,
initial position, and
waypoints.

When the position you

want is displayed, press

ENTER. Enter the date you
want the schedule for, then
press ENTER.

Press ENTER to accept
the current date.

ENTER.

OR

3-12

Press ENTER to begin
computing. As the sched­ule is computed the time is
marked off in 15 minute
intervals.

When computations are
complete, a "window of
availability" appears on the
display. This is the time
when there will be enough
satellites available to get a
position fix. If there is more
than one window the
DOWN ARROW appears
on the display.

See page 5-6 for more information.

SUPPORTING NMEA DEVICES

The unit can support NMEA devices when the Battery Saver is off or
the unit is operating from external power, and the dataport is turned on.
AUX 6 allows you to activate the dataport and select the outgoing
message format your NMEA device requires.

The NAV 5000 supports devices that accept 0180 or 0183 messages.

Press AUX, 6, and
ENTER.

3-13

Press the RIGHT ARROW

to select the outgoing

message format. Choose

between, 0183A, 0183B,

0183C, 0180, or OFF.

Refer to page 5-9 for more information an NMEA support.

3-14

CHAPTER 4

Function Keys

The function keys are used to operate the NAV 5000 and to access
information. The keys discussed in this chapter are described in
alphabetical order.

LAST FIX

Five of the most recent position fixes are saved in a temporary file as
LASTFX, FIX-02, FIX-03, FIX-04, and FIX-05. The position fixes can
be viewed by pressing LAST FIX. Each time this file is updated, the
last fix and backup fixes advance one place, and the position fix that
was saved as FIX-05 is discarded.

All position fix updates are not retained. When the Battery Saver is on
(unit operates for 2 minutes), the last position fix taken is stored as
LASTFX. When the Battery Saver is off or when the unit is being
operated from external power, the unit saves one fix every 10 minutes
as LASTFX.

LASTFX and any of the backup fixes can be stored as waypoints (see
page 4-42) and then used to define a Route (see page 4-18).

The Last Fix

Press LAST FIX to display
the coordinates of your
most recent position fix.
The screen also displays
the mode (2D, 3D or

AUTO) on the lower left,
and altitude on the lower
right.

4-1

Press the DOWN ARROW
to display the date and
ti

me of the fix and the

currently selected datum.

Press the DOWN ARROW
again to display satellite
signal information.

Last Fix Backups

The unit also retains four previous position fixes. They are stored as
FIX-02, FIX-03, FIX-04, and FIX-05.

4-2

To view the backup fixes,
press the RIGHT ARROW
once from the LASTFX
display.

Press the RIGHT ARROW
again to advance to
FIX-03.

Press the DOWN ARROW
once to see the second
position display (date and
ti

me of fix and current

datum).

Press the DOWN ARROW
again to see which satel­lites were used for the fix,
their signal qualities and
the geometric quality of the
fix.

Press the RIGHT ARROW
to move to the third
position screen of FIX-04.

4-3

LIGHT

The LIGHT key backlights the message display. Press the key to
turn the light on and off.

The light turns off automatically when the unit is turned off. lt also turns
off when the second battery warning appears, and if external power is
lost.

The brightness of the display when the light is on can also be modified
with AUX 2. See page 5-3.

NAVIGATION

The NAVIGATION (NAV) key provides Distance, Cross Track Error,
and Bearing- and Steering-related data.

Calculations are based on the most recent fix in relation to your
destination waypoint. Therefore, a route must be entered with ROUTE
before NAV can be used.

Before starting, enter your route and display the current leg.

To navigate to the first
destination, press NAV.

The first screen displays

Bearing, Distance to the

destination waypoint,
Cross Track Error, whether

you are right or left of your

route leg, and which leg

you are on.

4-4

XTE (Cross Track Error), on the third line of the sample screen above,
is the length of the perpendicular between your present position and
the courseline. lt is described as being to the right or left of the
courseline, facing the destination.

CROSS TRACK ERROR (XTE)

lf you are 9.99 nautical
or more from the
route leg the NAV
5000 will not compute a
Cross Track Error-(XTE).
"Invalid leg" message
displayed.

miles

selected

The

is

Press the DOWN ARROW
once to see Steering.
Steering indicates which
way the vessel should be
turned to head toward the
leg

destination,

given your
current ground course and
bearing.

4-5

Press the DOWN ARROW
again to see Estimated
Time of Arrival (ETA) at

your destination waypoint
and Velocity Made Good
(VMG).

Velocity Made Good (VMG) is the component of the total ground speed
that is parallel to the course line. (Ground speed is actual ground
speed, measured at a given instant.)

VELOCITY MADE GOOD

Press the DOWN ARROW
to see Time To Go (TTG)
and Speed Of Advance
(SOA).

Time To Go (TTG), on the second line of the screen above, is the
length of time required to complete the current leg, given the current

speed of advance.

Speed Of Advance (SOA), on the third line, is the component of the
ground speed in the direction of the destination waypoint. lt is calcu­lated using speed and ground course. When XTE = 0, SOA = VMG.

4-6

When you are within 500
feet (152.4 meters) of the
destination, the NAV 5000
beeps and the fourth line of
the screen reads "CLOSE."

ON/OFF

The On/Off key turns the NAV 5000 on and off.

When the Battery Saver is on, the NAV 5000 will take fixes for two
minutes after POS, NAV, or VEL is pressed, and then shuts off if no
other function keys are pressed. When the Battery Saver is off, the unit
operates continuously until the second battery warning appears (see
page 4-8). In continuous use alkaline batteries power the receiver for
about 10 hours.

When operating from external power, the unit operates continuously

until disconnected or until turned off with the ON/OFF key.

4-7

Self-Test

The NAV 5000 performs a self-test each time it is turned on.

When the unit is turned on,
the first display is a
temporary power status
message, indicating if the
unit is operating from
batteries or an external
power source.

The unit then performs a brief self-test of its memory, Almanac, and
power. The READY display appears when the self-test is complete.

To continue, press POS to find a position (See page 4-10).

If there is a problem, a power warning will also appear.

Power Warnings

The battery symbol

appears on the display
when the batteries are low,
and remains until the
batteries are replaced.

4-8

An additional power
warning appears when the
batteries become
dangerously low. The
batteries must be replaced
now, or all stored informa­tion may be lost.

The unit shuts itself off two minutes after this warning appears. You

may continue to operate only from external power.

This message appears
when the level of external
power being supplied to
the unit is lost or is below
minimum requirements.
Press any function key
except ON/OFF or LIGHT
to continue on battery
power.

4-9

POSITION (POS)

When the POS key is pressed the NAV 5000 checks its Almanac to
determine which satellites are scheduled to be in view, and which
of the available satellites will give the best geometry for a position fix. lf
satellites are scheduled to be in view, the receiver turns on and the
display goes to the receiver screen.

Taking a Position Fix

Press POS. The unit
its Almanac to
which satellites
available, based on
last position fix.

lf no satellites are sched­uled to be in view, the
receiver does not turn on.

lf satellites are scheduled
to be in view, the unit starts
the InstafixTM satellite
search algorithm. Satellite
receiver activity is moni­tored on the receiver status
screen.

checks

determine

are

your

4-10

The InstafixTM satellite search algorithm devotes all five channels to the

search for the satellite the Almanac indicates is directly overhead,
given your last fix or initial position. This greatly shortens the length of
ti

me required to obtain a position fix.

The first satellite is usually located in a few seconds, but when satellite
geometry is not optimum, it takes up to a minute. If the satellite cannot
be located, the unit looks for the satellite with the next highest eleva­tion.

Once the satellite has been
located, the receiver
searches for other satel­lites that are scheduled to
be in view.

Throughout the search and
acquisition of satellites the
receiver status screen
monitors the activity of all 5
channels. Refer to the
illustration on page 4-12 to
interpret this screen.

When the unit is first turned on, the unit's internal clock is updated in
the first 10 seconds of Ephemeris data collection. Thereafter, the clock
is updated every few position fixes.

4-11

A position fix is calculated when enough satellites for the mode you
have chosen have been acquired. lf the unit was initialized correctly,
the first position fix can be made in 55 seconds or less. Subsequent
fixes can be made in about 30 seconds, if the previous fix was made in
the last hour and you are using the same set of satellites.

READING THE RECEIVER STATUS SCREEN

Position Display

The position is automatically displayed on three screens when it
has been calculated. Scroll through the screens with the DOWN

ARROW.

The first position screen
shows the latitude,
longitude, mode, and
altitude. Remember that
altitude is a user-entered
value in 2D; the unit
computes it in 3D.

4-12

Press the DOWN ARROW

to see the current datum,

date, and time.

Press the DOWN ARROW
again to see which satel­lites were used to compute
the position, the satellite
signal quality, and the
geometric quality of the fix.
(See page 3-9 for a
description of SQ and GQ.
Refer to the Appendix for a
more detailed description.)

Press the DOWN ARROW again to return to the first screen.

The unit sometimes has enough satellites to calculate a position fix
before it has finished collecting or refreshing its Almanac. lt may
therefore verify the data in its Almanac to be certain that it is complete
and error-free.

ALM VERIFY appears on

the screen when the unit is

checking its Almanac. Do
not turn the unit off while
this message is on the

screen.

4-13

Continuous Operation

When the unit is in continuous operation, it updates the position fix
approximately every second. As satellites set or their signals become
and as other satellites rise, the unit occasionally changes
being used. This does not affect the unit's updating

which satellites are

the position fix.

blocked,

When the unit is operating from external power, it does not turn off until
OFF is pressed or power is lost.

Real-Time Messages

The messages below appear on the fourth line of the position screen.

ALM VERIFY

The entire Almanac was not collected; the unit is

identifying the missing data and collecting it. Do
not turn the unit off.

NOW IN 2D

Appears briefly the first time POS is pressed after

unit is turned on, and when the unit switches

from

3D to 2D.

NOW IN 3D

Appears briefly the first time POS is pressed after

unit is turned on, and when the unit switches

from

2D to 3D.

OId Data. Satellites have set or their signals have
become blocked, and there are not enough
to update the position fix; the position

satellites

displayed is

more than 10 seconds old.

The signal quality (SQ) of one or more satellite is 3
or lower. The lock on the satellite's Signal is not
strong, and may not be maintainable.

ON/

the

the

The geometric quality (GQ) of the position fix is 3
or less. The accuracy of this fix is uncertain; do not
use this fix for navigation purposes.

4-14

Search and Acquisition Errors

Under the following conditions, the unit may be unable to obtain a
position fix:

Initialization was not done correctly.

o

Poor signal environment.

o

Insufficient number of satellites.

o

Unit searches constantly.

o

Insufficient

The NAV 5000 checks its Almanac before beginning to search for
satellites. The receiver will not turn on if the Almanac indicates that not
enough satellites are within view to establish a position fix.

If you are operating with the Battery Saver on, the unit shuts itself off
if

it cannot locate enough satellites for a fix. Check Sat(ellite) Status

with

AUX 3 to be sure that no satellites have been set to "OFF."

Number of Satellites

This message appears
when the Almanac indi­cates that not enough
satellites are in view to
take a fix. The receiver
remains off.

This message appears
the unit is set to 3D
operation, and not enough
satellites are available for a
3D fix. Try 2D, which
requires fewer satellites.

when

Unit Searches Constantly

If the unit has an Almanac and is unable to locate satellites, it searches
continually until a satellite is found.

4-15

The unit may be unable to locate satellites under the following

conditions:

The antenna is not positioned correctly.

o

The satellite signals are blocked from view by buildings,

o

mountains, etc.

There are signal reflections that can be corrected by moving

o

the antenna.

o

There are satellite outages.

o

Satellites set to "OFF" in Sat Status.

Refer to AUX 3, Sat Status (page 5-3), to verify satellite status. Refer
to "Orienting the Antenna" (page 2-9) to position your antenna.

Initialization Error

An initialization error occurs when:

The initial position entered in SETUP or Initialization was

o

incorrect by 300 miles (487.2 km) or more.

The unit has been moved 300 miles (487.2 km) or more from

o

its last position fix or initial position.

Either condition can cause the unit to be unable to find the satellites it
looks for. Since the unit searches for satellites based on where it thinks
it is, an incorrect initial position or a LASTFX that is 300 miles (487.2
km) or more away from the unit's current position may cause the unit
to

search for satellites that are not available at the unit's true location.

Either condition can also cause the unit to calculate a position fix that
is 300 miles (487.2 km) or more from its initial position or LASTFX. The
unit regards this position fix as an error, and tries three more times to
obtain a position fix that it can accept.

lf the unit cannot locate any satellites, or after the fourth attempt to
obtain an acceptable position fix, the unit discards the initial position or
LASTFX and assumes that an initialization error has occurred. The unit
displays the receiver status screen, and "SKY SEARCH" appears on
fourth line of the screen.

4-16

the

Briefly, since the unit already has an Almanac, it skips the first part of
Sky Search, which collects a new Almanac. The unit simply searches
the sky for satellites until it locates enough to verify its position and
calculate a new position fix. This usually takes 15 minutes.

lf the unit does not have a new position fix after about 20 minutes,
either reinitialize the unit (page 2-5 or 4-27) or enter Sky Search with
AUX 5 (page 5-8) to collect a new Almanac.

Accuracy Warning Symbol

The accuracy of a position fix is determined by the position of the
satellites used relative to each other. The closer the satellites are to
each other, the less accurate the fix is. This is referred to as geometric
quality, and is displayed on the third screen of a fix as GQ. (GQ is
described in greater detail in the Appendix.)

This symbol appears on
the fourth line of all
screens of a position fix

when the GQ is 3 or less.

Signal Quality

The unit also measures the strength of the signal it receives from the
satellites and displays this information on the third screen of the
position fix. An SQ of 4 and above indicates a strong signal: 0 to 3
indicates a signal so weak that it may be lost.

fix; it

Signal Quality (SQ) does not affect the accuracy of the
in

tended only to alert you that a signal from one or more satellites is

not

as strong as it could be.

4-17

is

This symbol appears on all
three screens of the
position fix when the SQ
from one or more satellites
is 3 or less.

Old Data

The unit automatically updates its position every second. If a satellite
signal is lost, or a satellite sets or becomes obstructed, the unit
other satellites to update the fix. If other satellites are not
unit cannot update the position fix.

The hourglass symbol
appears on the position
display when the unit is
displaying a position fix
that is at least 10 seconds
old. The position displayed
not current, and should
be used for navigating.

switches to

available, the

is

not

ROUTE

The ROUTE key is used to enter a route consisting of 1 to 10 legs and
change route legs.

A route is established by setting a series of waypoints to correspond to
legs of the route.

A route can be followed in either the automatic or manual mode. The
mode is selected in SETUP. (See page 4-33.)

In either mode, when following a route, the navigation screen is
every second, and the unit displays a "CLOSE" message

4-18

updated

to

the

route

when you arrive within 500 Feet (152.4 meters) of the current leg's
destination.

In the automatic mode, when you cross an imaginary line that
intersects your destination and is perpendicular to your courseline, the
unit automatically changes to the next leg of your route (see diagram
below.)

In the manual mode, when you cross the imaginary perpendicular line
you must change to the next leg manually. Press ROUTE and the
RIGHT ARROW to move to the next leg. (Refer to the illustration

below.)

THE ROUTE LEG

Multi-Leg Routes and NMEA

The NAV 5000 output NMEA data is based on positions related to a

multi-leg route. Navigation data is sent out through the NMEA port

4-19

when the dataport is turned an (AUX 6); a route is entered; a leg is

selected; the POS, VEL, or NAV key is pressed; and the first fix has
been made.

Creating a Route

Use the following key sequences to enter a route.

Press the ROUTE key. The
current leg of an existing
route will appear.

Erase the existing route by

pressing CLEAR twice.

The unit automatically
displays the current
position (POS).

Use the RIGHT ARROW to
scroll through the stored
waypoints in alphabetical
order, and then back to
POS. You can also enter
the first letter of the desired
waypoint and ENTER, then
use the RIGHT ARROW to
scroll through the rest of
the waypoints.

4-20

When you reach the
waypoint you want to use
as the course start, press
ENTER.

You may choose POS as the starting point or destination of a leg.
When POS is chosen, it is stored as waypoint "start." POS will no
longer be available when defining a route leg; you may, however, use
"start."

Select the leg's destination
the same way. When the
desired position is dis­played, press ENTER.
The unit automatically
moves to the next
leg.

This screen is displayed if
there are no waypoints
stored in the unit's
memory. You
waypoints to set a route.

must

have

4-21

Repeat the steps above to
enter route segments until
you have completed your
route, or until all ten legs
have been set.

Viewing an Existing Route

When all of the route legs
have been set, press
ENTER twice. The screen

goes to leg 1 of the route

you just created.

To view the route you just
created, press ROUTE and
use the RIGHT ARROW to
scroll through the legs.
Press NAV, POS, or VEL
to display navigation data
relative to the route leg and
destination.

Resetting a Route

Routes can be reset by pressing the ROUTE key, selecting a new leg,
then pressing POS, NAV, or VEL. You can also enter a new route,
select a leg, then press POS, NAV, or VEL.

Route Modes

The automatic and manual modes are selected with the SETUP key.

4-22

Press the SETUP key to
view this message.

Press the DOWN ARROW
until you reach the Route
Mode screen.

Press the RIGHT ARROW
to toggle between

Automatic and Manual

modes.

4-23

Automatic Mode

When a route is being
followed in the automatic
mode, press the NAV key
after selecting the current
leg. This displays naviga­tion data for the current
leg. (See NAV, page 4-4.)

lf you are 9.99 nautical
miles or more from your
courseline, the unit cannot
compute a cross track
error and the invalid leg
message appears. Clear
message by choosing
a more appropriate leg or
by clearing the route
completely.

When you are within 500
feet (152.4 meters) of your
destination, "CLOSE"
appears on the bottom line.

the

4-24

Imagine that a line inter­sects the destination
waypoint and is perpen­dicular to the courseline.
(See the Illustration on
page 4-19.) When you
cross that line, the unit
automatically switches to
the next leg of the route.

Manual Mode

When you arrive at the
final destination of the last
route leg, the unit displays
the "COMPLETE" mes­sage.

Press the NAV key after
selecting the route leg.

When you are within 500
feet (152.4 meters) of your
destination, the display
shows the "CLOSE"
message.

4-25

Imagine that a line inter­sects the destination
waypoint and is perpen­dicular to the courseline.
(See the illustration on
page 4-19.) When you
cross that line, the unit
displays the message
"ARRIVED."

Press ROUTE, then the
RIGHT ARROW to scroll to
the next leg. Press NAV to
return to the navigation
screen.

When you reach the
route's final destination,
the unit sounds a beeper,
and the screen displays
the "COMPLETE"
message.

SETUP

SETUP is used to initialize the unit before it is used for the first time or
when it has been moved more than 300 miles (487.2 km) from where
the last fix was taken. (Although it is possible to get a position fix
without an initialized position, the unit performs better when it has been
initialized manually.) SETUP is also used to modify a configuration

item and when the unit has suffered a memory loss.

4-26

In SETUP you can:

Initialize a position

o

Choose a position mode (2D, 3D, or Automatic)

o

Choose a local clock for time display

o
o

Set the time (local clock)

o

Choose an automatic or manual Route Mode
Select the Lat/Lon display

o
o

Select a Map Datum

o

Enter a Magnetic Variation
Select Distance and Speed Units

o
o

Select Altitude Units

o

Select the Date Order

Before pressing SETUP, take a minute or two and fill out the
on page 4-28. Keep the worksheet as a reference, so you
if the unit loses its memory and must be recustomized.

Press SETUP and then the DOWN ARROW to display the SETUP
in sequence. Use the RIGHT ARROW to toggle between the
within each feature.

worksheet

can refer to it

features

selections

Entering an Initialization Position

The initial position entered here must be correct within 300 miles
(487.2 km). If you are not sure of your position, call your local mari­ne

electronics dealer or consult an atlas or chart.

The unit should be reinitialized if it is moved more than 300 miles
(487.2 km) from the last fix or suffers a memory loss.

4-27

SETUP WORKSHEET

SELECT ONE OPTION FOR EACH SETUP FEATURE
(Factory defaults

MODE

are shown in bold)

❑

2D

3D

❑

Automatic

❑

TIME DISPLAY

ROUTE MODE

LAT/LON DISPLAY

MAP DATUMS

UT (UNIVERSAL

❑

COORDINATE TIME)

LOCAL (AM/PM)

❑

Automatic

❑

❑

Manual

DEGREES/MINUTES

❑

DEGREES/MINUTES

❑

/SECONDS

WGS84

USER
AUSTR
EUROP
NAD27
ALASK
MAUZ
OAHU
KAUAI
GRB36
TOKYO
WGS72

MAGNETIC VARIATION

4-28

M) AUTO MAG

❑

(

(T) TRUE

❑

(U) (USER SET)

❑

__°__ E or W (SPECIFY)

SETUP WORKSHEET (Cont'd)

DISTANCE, SPEED UNITS

ALTITUDE UNITS

DATE ORDER

NM (nautical miles) and

❑

KNOTS (knots)

❑

Km (kilometers) and Km/HR
(kilometers per hour)

❑

MI (statute miles) and MPH
(

miles per hour)

❑

feet

❑

meters

❑

MONTH/DAY/YEAR

DAY/MONTH/YEAR

❑

4-29

Press SETUP to see the
itial position. If a position
displayed, erase it. You
erase a position by
pressing CLEAR or by
entering the first number of
the new position; the old
position will disappear.

Enter the latitude, using
the RIGHT ARROW to

toggle between N and S. If

your latitude ends with

zeroes they do not have to

be entered; the unit will

add them. Press ENTER.

Enter the longitude, using

the RIGHT ARROW to

toggle between E and W.

Press ENTER.

in­can

is

Selecting Mode and Altitude

The NAV 5000 has three modes of operation. The default mode is 2D;
2D requires a user-entered value for altitude and is used primarily at
sea. lt uses three satellites to calculate latitude and longitude. The 3D
mode uses a fourth satellite to compute your altitude for you; it is used

4-30

primarily on land. Automatic selects 2D or 3D, according to how many

satellites are available. If the unit is intended for maritime use, we
recommend using the 2D mode for greater accuracy.

From the first SETUP
display (initial position),
press the DOWN ARROW.

Press CLEAR to erase an

existing altitude or simply

enter a new value. Enter

any new altitude. Use the

RIGHT ARROW to toggle

to a negative altitude.

Press ENTER.

If you prefer to use meters instead of feet, the unit of measure is
defined later in SETUP (see page 4-40). The NAV 5000 recalculates
stored altitudes when the unit of measure is changed. lt you know
altitude in feet, go ahead and enter it now.

Press the RIGHT ARROW
to scroll to 3D. (Altitude
can also be changed at
this screen.)

4-31

the

your

Press the RIGHT ARROW

to go to the Automatic

mode. Remember that if
you use this mode, some

fixes may be made in 2D.

Therefore, be sure you

have entered an altitude.

Setting the Time

The unit can be operated on Universal Time (UT, formerly Greenwich
Mean Time) or local time.

The GPS satellites operate on UT, and the unit collects the current
time (in UT) from the satellites as part of the Almanac. lt is therefore
unnecessary to set time if you want to use UT. You must remember,
however, that UT displays the time and date that is current at the
me Meridian.

Pri-

If you prefer to use a local clock, you must enter the local date and

ti

me here.

From the mode/altitude
display, press the DOWN
ARROW. The screen

displays the current date

and time on the UT clock.

4-32

To enter the local date and

ti

me, press CLEAR. Key in
the current date, in month/
day/year order. (Date order
can be changed later in

SETUP.) Press ENTER.

Press the RIGHT ARROW
change to local time.
Key in the local time (hours

and minutes), and use the

RIGHT ARROW to toggle

between AM and PM.
(Local time does not use a

24-hour clock.) Press

ENTER.

Choosing Automatic or Manual Route Modes

A route can be followed in either the automatic or manual modes.

In the automatic mode, the NAV 5000 continually updates the naviga­tion screen. When you are within 500 feet (152.4 meters) of the
destination of a navigation leg the screen displays a "CLOSE" mes­sage. When you cross an imaginary line that runs through your desti­nation waypoint and is perpendicular to your courseline, the unit
automatically switches to the next leg of your route.

In the manual mode, the NAV 5000 continually updates the navigation

screen, and displays the "CLOSE" message when you are within 500

feet (152.4 meters) of your destination waypoint. When you cross the

imaginary line that runs through the waypoint and is perpendicular to

the courseline, however, the unit does not advance to the next leg, but

displays an "ARRIVED" message. You must press ROUTE and the

RIGHT ARROW to advance to the next leg.

to

See page 4-18 for a more detailed description of the ROUTE function.

4-33

To select automatic or manual route mode, use the key sequences
below. (Default is Automatic.)

From the initial time
display, press the DOWN
ARROW.

Press the RIGHT ARROW
to toggle between
automatic and manual
modes.

Choosing Lat/Lon Display

The latitude and longitude can be displayed in degrees and minutes
(

DEG/MIN) or in degrees/minutes/seconds (DEG/MIN/SEC). (Default is

DEG/MIN.)

4-34

From the route mode
display, press the DOWN
ARROW.

Use the RIGHT ARROW to
toggle between Deg/Min
and Deg/Min/Sec.

Selecting a Map Datum

The NAV 5000 provides 12 geodetic map datums for use with charts
and maps worldwide. The unit also allows you to enter manually
any

map datum not currently in the unit's memory.

A datum refers to a mathematical model of the earth. The latitude and
longitude of a position differs from one model (datum) to another. lt is
therefore important to know which map datum you will be using if you
want to relate your position information to a chart, since using a
different datum may result in positioning errors of up to 1968.5 feet
(600 meters) when compared with the chart.

The Map Datum feature allows you to operate the NAV 5000 on a
datum that corresponds to the charts you are using. Which datum your
chart uses can usually be found in the legend.

From the Lat/Lon display,

press the DOWN ARROW.

4-35

Use the RIGHT ARROW to
scroll through the available

datums until you find one
that corresponds to your
chart. Press ENTER.

Setting a User-Entered Datum

If your Chart uses a datum that is not included in the choices listed on
the SETUP worksheet, you can use a user-entered datum. Refer to
Appendix 2 for the constants to convert the most common local datums
to WGS84.

From the LAT/LON display,
press the DOWN ARROW.

Press the RIGHT ARROW
until this message ap­pears.

4-36

4-37

Press ENTER, then enter

Press ENTER again to

store the values entered.

Magnetic Variation Display

Select one of the three available heading and bearing types for all
displays and entries.

Auto Mag (M) lncludes an automatic adjustment for variation

by the NAV 5000. (Default)
True (T)

Set (U)

No magnetic adjustment in readout

A constant user-entered adjustment

From the Map Datum
display, press the DOWN
ARROW to reach this
display.

Use the RIGHT ARROW to
toggle between the choices
listed above. If you select

User Set (U), the screen
displays the last entered
value.

4-38

DIstance/Speed Units

To change the value
displayed, either press
CLEAR or begin entering
numbers to clear the
display. Enter the constant
compass error in degrees
and minutes. Use the
RIGHT ARROW to toggle

between East and

West.

Press ENTER and the
display returns to the

magnetic variation display.

4-39

From the magnetic varia­tion display, press the

DOWN ARROW. The
currently selected unit of
measurement for distance

and speed is displayed.

Altitude Units

Use the RIGHT ARROW to
toggle between nautical
miles and knots, kilometers

and kilometers per hour,
and statute miles and miles

per hour.

From the distance/speed
display, press the DOWN
ARROW to view altitude
units. The default unit of
measurement is feet.

Use the RIGHT ARROW to
toggle between feet and
meters.

Changing altitude units affects all displays where altitude is shown.
The unit recalculates all altitude measurements to the new unit of
measure.

4-40

Date Order

From the altitude display,
press the DOWN ARROW
to view the date order.

Use the RIGHT ARROW to
change the date order.

Press the DOWN ARROW to return to the first SETUP display. Press
any function key other than SETUP, DOWN ARROW, or RIGHT
ARROW to exit SETUP.

VELOCITY

The VELOCITY key displays information about your rate and direction
of travel. (Speed Over Ground and ground course). This information is
available only in continuous operation and when your speed exceeds

0.2 knots. (Speeds greater than 951 mph/1529.5 kph/826.73 knots

cannot be measured.)

Press VEL.

4-41

WAYPOINT

The WAYPOINT (WPT) key lets you enter up to 100 positions in the
unit's memory by saving a current position, a last fix, or a fix backup, or

by manually entering a position. Waypoints can also be viewed,

deleted, and renamed.

Waypoints are stored in alphanumeric order.

Saving Positions as Waypoints

Use the following key sequence to save a position as a waypoint.

Locate the position fix you
want to save.

Press the ENTER key. The
cursor goes to the upper
left corner on the message
display.

4-42

Name the waypoint. Enter
one to six characters as
described in "Entering
Data" on page 2-14. Press
ENTER.

OR

Press ENTER to name the
waypoint automatically.

If the name you chose is
already being used, this
message appears. Press
ENTER and key in another
name.

4-43

If you do not choose a
name for the waypoint, the
NAV 5000 generates one.
Unit-generated names are
in the format WPTxxx,
where xxx represents
numbers 001 through 099.
Waypoints are numbered
in sequence.

To allow the unit to name

the waypoint, simply press

ENTER again.

Once the position has been saved, date/time message can be ac­cessed by pressing the DOWN ARROW. Use the RIGHT ARROW to
display waypoints in alphabetical order .

Entering Waypoints Manually

Use the following key sequence to enter a waypoint manually.

Press the WPT key.

Press the ENTER key
once.

TUNA

Enter a one- to six­character waypoint name
from the alphanumeric
keypad, or press ENTER

again to name the
waypoint automatically.

4-44

This message appears if
the name you chose is
already being used. Press
ENTER and key in.

Key in the latitude. Press
ENTER. Use the RIGHT
ARROW to toggle between
N (north) and S (south).

Key in the longitude. Use
the RIGHT ARROW to
toggle between W (west)
and E (east). Press
ENTER.

4-45

Viewing Stored Waypoints

Key in the altitude. Use the
RIGHT ARROW to toggle
between positive and
negative values (above
and below sea level).
Press ENTER.

Press ENTER again to
store this information.
When ENTER has been
pressed, the DOWN
ARROW appears on the
display.

lf this message appears,
there is no room to store
another waypoint. You
must delete a waypoint
before another can be
stored. See "Clearing
Waypoints" below.

Use the following key sequence to access and view a waypoint.

Press the WPT key.

4-46

Press the RIGHT ARROW
to scroll through the stored
waypoints. You can also
key in all or part of a
waypoint name and press
ENTER. Use the RIGHT
ARROW to continue to
scroll.

Press the DOWN ARROW

to see the datum, date,

and time of the position fix

for TUNA.

Press the DOWN ARROW

again to see the satellite
signal quality and
geometric quality of the fix.

lf a waypoint was entered
manually, no values will
be displayed for satellite
signal quality and
geometric quality.

Renaming Waypoints

To rename a waypoint, retrieve it as described in "Viewing a
Waypoint." From any of the waypoint message displays, press EN­TER. Enter the new name, and press ENTER again.

Waypoints that are assigned to a route cannot be renamed. This
includes the waypoint "start".

4-47

Waypoint "start" can, however, be copied. Retrieve the waypoint and
rename it as described above. The unit copies the position data from
"start" to the new waypoint name. "Start" is untouched until a new route

is entered.

Clearing a Waypoint

Use the following key sequence to delete a waypoint from the unit's

memory.

Locate and retrieve the
waypoint, as described in
"Viewing a Waypoint."
CLEAR. The display
the message

illustrated.

Press

shows

To continue and erase the waypoint, press CLEAR again.
To abort and keep the waypoint, press any function key.
To clear

all

waypoints, use AUX 10.

4-48

CHAPTER 5

AUXILIARY FUNCTIONS

In addition to the 9 function keys described in Chapter 4, the NAV 5000
has 11 auxiliary functions. The Auxiliary Functions give you additional
information and control over how the unit displays information.

The Auxiliary Functions can be accessed two ways.

Press AUX and the
number of the Auxiliary
Function you want to
access, followed by
ENTER.

OR

Press AUX and use the
RIGHT ARROW to scroll

through the Auxiliary

Functions until you see the
one you want. Then press
ENTER.

This chapter is arranged in numerical order; for your convenience, a
table at the end of the chapter arranges the functions in alphabetical
order.

5-1

AUX 1- RECEIVER STATUS SCREEN

The receiver status screen allows you to monitor the search, acquisi­tion, and ranging of satellites that are visible and may be used for a
position fix.

The receiver status display appears when POS is pressed. You can
also go to this display manually when you want to know which satel­lites are being tracked and the signal quality from each satellite. This
can be helpful if you are having difficulty getting a position fix, espe­cially if you think the signals may be blocked.

Press AUX, 1, and ENTER
(or AUX and the RIGHT
ARROW).

Each column on the display represents a channel; the unit searches for
the five satellites identified on the first line simultaneously. The second
line monitors the search and acquisition of the satellites. The third line
identifies the satellites that have been or will be used for the position
fix, and which satellites the unit has collected Ephemeris data from.
(Refer to the Illustration below.)

READING THE RECEIVER STATUS SCREEN

5-2

The mode of operation (2D or 3D) is indicated by the number of

satellites marked with an asterisk. On the sample above, 4 satellites
have asterisks, therefore, the position fix will be in 3D. If the unit were
in 2D, 3 satellites would have asterisks, and only 4 channels would be
displayed.

AUX 2 - DISPLAY CONTROL

The Display Control function allows you to change the brightness of
the display.

Press AUX, 2, and ENTER
(or press AUX once and
RIGHT ARROW twice)
view the Display Control
screen.

Press LIGHT to backlight
the display. Press the
RIGHT ARROW to change
the display brightness.

to

the

The possible levels of brightness are 1 through 15. Each time the
RIGHT ARROW is pressed, the brightness setting increases by one. At
15, the value rotates back to 1. (The default setting is 15.)

Once set, the values chosen remain unchanged until reset or the unit's
memory is lost or cleared.

AUX 3 - SATELLITE STATUS

Satellite Status (referred to as "Sat Status" throughout this guide)
provides specific information on the satellites used by GPS. Sat Status
can give you the following information:

which satellites are listed as being healthy by the GPS system

o

operators.

the elevation and azimuth of the satellites that are above the

o

horizon.

5-3

satellites with weak SQs or set temporarily unusable by the

o

system operators.

the current status of every satellite in the system.

o

The satellite status display includes one of the following messages:

GPS

ON:

TEMP OFF: 

OFF:

Satellites that are listed in the Almanac as being unhealthy by the GPS
operators are not listed in Sat Status. Satellites are identified
by a pseudorange number (PRN), which is used by the government to
the satellites.

the satellite is operating and is healthy.

the unit is temporarily ignoring this satellite.

Usually a satellite is being ignored because,
after three tries, the unit was unable to find it.
This happens when a satellite is hidden from
view by buildings or other large obstacles. The
will be temporarily off until the unit is
turned off and back on, or until the satellite is
the fifth channel.

the unit has been instructed to ignore this

satellite by the user, perhaps because its SQ
is very low. The satellite remains off until it is reset.

located by

Press AUX, 3, and ENTER
(or press AUX once and
RIGHT ARROW three

mes) to reach the Sat

ti
Status display. The first
display is the message
POS.

satellite

system

identity

the

5-4

You can analyze your
current position or press
the RIGHT ARROW to
analyze a waypoint.

Press ENTER to accept
the displayed position. The
current date and time is
displayed. lt you want to
reset the date and time,
you can do this now.

Press ENTER again. The
unit computes and displays
the current status of
all healthy satellites in
numerical order. Elevation
and azimuth is displayed
for satellites that are above
the horizon. An SQ is
when the satellite
was used to
a position

Press the DOWN ARROW
to display the status of the
next satellite.

recently obtain

fix.

shown

displayed

5-5

Press the RIGHT ARROW

to toggle between ON and
OFF for this satellite. Press
the DOWN ARROW to

view Sat Status for the
next satellite.