Garmin GPS 15 User Manual

GPS 15
TECHNICAL
SPECIFICATIONS

GARMIN International, Inc.

1200 E. 151

Olathe, KS 66062 USA

190-00266-00, Revision A

August 2002

st

Street

££££

© Copyright 2002

GARMIN Ltd. or its subsidiaries

All Rights Reserved

Except as expressly provided below, no part of this manual may be reproduced, copied, transmitted, disseminated,
downloaded or stored in any storage medium, for any purpose without the express prior written consent of GARMIN.
GARMIN hereby grants permission to download a single copy of this manual and of any revision to this manual onto a
hard drive or other electronic storage medium to be viewed and to print one copy of this manual or of any revision
hereto, provided that such electronic or printed copy of this manual or revision must contain the complete text of this
copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision
hereto is strictly prohibited.

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.

GARMIN International, Inc.

1200 East 151
Olathe, KS 66062 U.S.A.
Telephone: [phone]

FAX: [phone]

GARMIN (Europe) Ltd.

Unit 5, The Quadrangle, Abbey Park Industrial Estate

Romsey SO51 9AQ, U.K.

Telephone: [phone]

FAX: [phone]

GARMIN Corporation

No. 68, Jangshu 2
Shijr, Taipei County, Taiwan
Telephone: [phone]

FAX: [phone]

Web Site Address: www.garmin.com

st

Street

nd

Road

RECORD OF REVISIONS

Revision Revision

Date

A 8/16/02 Initial Release --

Description ECO #

Page A GPS 15 TECHNICAL SPECIFICATIONS
Rev. A P/N 190-00266-00

TABLE OF CONTENTS

1. INTRODUCTION

1.1 CAUTIONS ........................................................................................................................................................ 1

1.2 LIMITED WARRANTY .................................................................................................................................... 2

1.3 OVERVIEW ....................................................................................................................................................... 3

1.4 FEATURES ........................................................................................................................................................ 3

1.5 TECHNICAL SPECIFICATIONS...................................................................................................................... 4

2. PINOUT

2.1 DESCRIPTION .................................................................................................................................................. 6

2.2 DIAGRAMS ....................................................................................................................................................... 7

3. SOFTWARE INTERFACE

3.1 RECEIVED NMEA 0183 SENTENCES............................................................................................................ 8

3.2 TRANSMITTED NMEA 0183 SENTENCES.................................................................................................. 10

4. MECHANICAL CHARACTERISTICS & MOUNTING.........................................................................14

Appendix A. EARTH DATUMS...................................................................................................................15

GPS 15 TECHNICAL SPECIFICATIONS Page i
P/N 190-00266-00 Rev. A

LIST OF FIGURES

FIGURE 1. COMPUTER SERIAL PORT INTERCONNECTION ................................................................................ 7

FIGURE 2. PDA SERIAL PORT INTERCONNECTION.............................................................................................. 7

FIGURE 3. BASIC NMEA DEVICE INTERCONNECTION........................................................................................ 7

FIGURE 4. GPS 15-F DIMENSIONS........................................................................................................................... 14

FIGURE 5. GPS 15-W OUTLINE DRAWING............................................................................................................. 14

LIST OF TABLES

TABLE 1. SIGNAL/WIRE DESCRIPTIONS ................................................................................................................. 6

TABLE 2. NMEA 0183 OUTPUT SENTENCE ORDER............................................................................................. 10

Page ii GPS 15 TECHNICAL SPECIFICATIONS
Rev. A P/N 190-00266-00

1 INTRODUCTION

1.1 CAUTIONS

CAUTION

The GPS system is operated by the government of the United States, which is solely responsible for its
accuracy and maintenance. Although the GPS 15 is a precision electronic NAVigation AID (NAVAID),
any NAVAID can be misused or misinterpreted, and therefore become unsafe. Use these products at your
own risk. To reduce the risk, carefully review and understand all aspects of these Technical Specifications
before using the GPS 15. When in actual use, carefully compare indications from the GPS to all available
navigation sources including the information from other NAVAIDs, visual sightings, charts, etc. For safety,
always resolve any discrepancies before continuing navigation.

FCC Compliance

The GPS 15 complies with Part 15 of the FCC interference limits for Class B digital devices FOR HOME
OR OFFICE USE. These limits are designed to provide reasonable protection against harmful interference
in a residential installation, and are more stringent than “outdoor” requirements.

Operation of this device is subject to the following conditions: (1) This device may not cause harmful
interference, and (2) this device must accept any interference received, including interference that may
cause undesired operation.

This equipment generates, uses and can radiate radio frequency energy and, 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
and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

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

The GPS 15 does not contain any user-serviceable parts. Unauthorized repairs or modifications could result
in permanent damage to the equipment, and void your warranty and your authority to operate this device
under Part 15 regulations.

GPS 15 TECHNICAL SPECIFICATIONS Page 1
P/N 190-00266-00 Rev. A

1.2 LIMITED WARRANTY

This GARMIN product is warranted to be free from defects in materials or workmanship for one year from the
date of purchase. Within this period, GARMIN will at its sole option, repair or replace any components that fail
in normal use. Such repairs or replacement will be made at no charge to the customer for parts or labor,
provided that the customer shall be responsible for any transportation cost. This warranty does not cover failures
due to abuse, misuse, accident or unauthorized alteration or repairs.

THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL
OTHER WARRANTIES EXPRESS OR IMPLIED OR STATUTORY, INCLUDING ANY LIABILITY
ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS,
WHICH MAY VARY FROM STATE TO STATE.

IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR
CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE, OR INABILITY TO
USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some states do not allow the exclusion of
incidental or consequential damages, so the above limitations may not apply to you.

GARMIN retains the exclusive right to repair or replace the unit or software or offer a full refund of the purchase
price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR
ANY BREACH OF WARRANTY.

To obtain warranty service, contact your local GARMIN authorized dealer. Or call GARMIN Customer Service
at one of the numbers shown below, for shipping instructions and an RMA tracking number. The unit should be
securely packed with the tracking number clearly written on the outside of the package. The unit should then be
sent, freight charges prepaid, to any GARMIN warranty service station. A copy of the original sales receipt is
required as the proof of purchase for warranty repairs.

GARMIN International, Inc. GARMIN (Europe) Ltd.
1200 East 151
Olathe, Kansas 66062, U.S.A. Romsey, SO51 9AQ, U.K.
Phone: [phone] Phone: [phone]
FAX: [phone] FAX: [phone]

st

Street Unit 5, The Quadrangle, Abbey Park Industrial Estate

Page 2 GPS 15 TECHNICAL SPECIFICATIONS
Rev. A P/N 190-00266-00

1.3 OVERVIEW

The GPS 15 is part of GARMIN’s latest generation of GPS sensor boards designed for a broad spectrum of
OEM (Original Equipment Manufacture) system applications. Based on the proven technology found in
other GARMIN 12-channel GPS receivers, the GPS 15 will track up to 12 satellites at a time while
providing fast time-to-first-fix, one-second navigation updates and low power consumption. Its far-reaching
capabilities meet the sensitivity requirements of land navigation as well as the dynamics requirements of
high-performance aircraft.

These GPS designs utilize the latest technology and high-level circuit integration to achieve superior
performance while minimizing space and power requirements. All critical components of the system
including the RF/IF receiver hardware and the digital baseband are designed and manufactured by
GARMIN to ensure the quality and capability of the GPS. The hardware capability combined with software
intelligence makes the GPS 15 easy to integrate and use.

These are complete GPS receivers that require minimal additional components to be supplied by an OEM
or system integrator. A minimum system must provide the GPS with a source of power, an active GPS
antenna, and a clear view of the GPS satellites. The system may communicate with the GPS 15 via its
CMOS-level serial port. The GPS 15 stores data such as satellite orbital parameters, last-known position,
date and time in battery backed up SRAM. End user interfaces such as keyboards and displays are the
responsibility of the application designer.

1.4 FEATURES

• 12-channel GPS receiver tracks and uses up to 12 satellites for fast, accurate positioning and low power

consumption.

• Compact, rugged design ideal for applications with minimal space. May be remotely mounted in an

out-of-the-way location. Receiver status information can be displayed directly on a chartplotter or PC.

• User initialization is not required. Once installed, unit will automatically transmit navigation data.

• User-configurable navigation mode (2-dimensional or 3-dimensional fix).

• Provision for external power to maintain the non-volatile SRAM and real-time clock.

• Optional on-board backup battery to maintain the non-volatile SRAM and real-time clock for up to

21 days.

GPS 15 TECHNICAL SPECIFICATIONS Page 3
P/N 190-00266-00 Rev. A

1.5 TECHNICAL SPECIFICATIONS

Specifications are subject to change without notice.

1.5.1 Physical Characteristics

1.5.1.1 Size

0.940” (23.88 mm) wide, 1.690” (42.93 mm) long, 0.309” (7.84 mm) high

1.5.1.2 Weight

0.35 oz. (10 g)

1.5.1.3 Available Connector Options

• GPS 15-F:

GPS 15-F: 6-pin LIF connector, 1 millimeter pitch

• GPS 15-W:

GPS 15-W: 6-pin JST connector, 1 millimeter pitch; mating wire harness included

(NOTE: available in Asia, or by special order)

1.5.2 Electrical Characteristics

1.5.2.1 Input Voltage

3.3 Vdc regulated, ±50 mV ripple

1.5.2.2 Input Current

85 mA peak, 80 mA nominal

1.5.2.3 GPS Receiver Sensitivity

-165 dBW minimum

1.5.3 GPS Performance

1.5.3.1 Receiver

• 12 parallel channel GPS receiver continuously tracks and uses up to 12 satellites to compute and update

your position.

1.5.3.2 Acquisition Times

• Reacquisition: Less than 2 seconds

• Warm: Approximately 15 seconds (all data known)

• Cold: Approximately 45 seconds (initial position, time and almanac known, ephemeris

• AutoLocate

• SkySearch: 5 minutes (no data known)

1.5.3.3 Update Rate

• 1 second

1.5.3.4 Accuracy

• GPS Standard Positioning Service (SPS)

Position: < 15 meters, 95% typical (100 meters with Selective Availability on)
Velocity: 0.1 knot RMS steady state

• Dynamics: 999 knots velocity (only limited at altitude greater than 60,000 feet), 6g dynamics

TM

: 5 minutes (almanac known, initial position and time unknown)

unknown)

Page 4 GPS 15 TECHNICAL SPECIFICATIONS
Rev. A P/N 190-00266-00

1.5.4 Interfaces

1.5.4.1 Electrical Characteristics

1.5.4.1.1 GPS 15

• CMOS level output for interfacing directly to a host microprocessor.

• Jumper settings determine baud rate. Factory setting is 4800 baud.

1.5.4.2 Port 1 Protocols

• NMEA 0183 Version 3.00

• ASCII output sentences GPGGA, GPGSA, GPGSV, and GPRMC (NMEA-approved sentences);

PGRME, PGRMM, and PGRMT (GARMIN proprietary sentences)

• NMEA 0183 Outputs (see Section 3.2 for full protocol specifications)

Position, velocity and time
Receiver and satellite status
Geometry and error estimates

• NMEA 0183 Inputs (see Section 3.1 for full protocol specifications)

Initial position, date and time (not required)
Earth datum

1.5.5 Environmental Characteristics

• Temperature: -30°C to +80°C (Operating); -40°C to +90°C (Storage)

GPS 15 TECHNICAL SPECIFICATIONS Page 5
P/N 190-00266-00 Rev. A

2 PINOUT

2.1 DESCRIPTION

The GPS 15-F utilizes a six-pin LIF connector. The GPS 15-W utilizes a six-pin JST connector with
mating wire harness included.

Table 1. Signal/Wire Descriptions

GPS

15

Pin #

1 BACKUP POWER This input provides external power to maintain the battery-backed SRAM

2 GROUND Power and Signal Ground
3 POWER Regulated +3.3 Vdc input. Peak operating current is 85 mA. Nominal

4 PORT 1 DATA OUT Serial Asynchronous Output.

5 PORT 1 DATA IN First Serial Asynchronous Input.

6 RF BIAS This input allows the user to externally apply a RF bias to the active

Signal Name Description

and real-time clock. This enables the user to provide backup power if
needed for longer than the optional on-board backup battery will provide
(roughly 21 days). Input voltage must be between +2.8 and +3.4 Vdc.

operating current is 80 mA.

CMOS compatible output designed to interface directly with a host
microprocessor. Provides serial data which is formatted per “NMEA 0183,
Version 3.0”. The baud rate is set during production to 4800, but other rates
are available.

CMOS compatible input designed to interface directly with a host
microprocessor. Maximum input voltage range of 0 < V < 3.3.

antenna. Units are shipped with this feature disabled. By default, the unit
will use an internal voltage to power the active antenna.

Page 6 GPS 15 TECHNICAL SPECIFICATIONS
Rev. A P/N 190-00266-00

2.2 DIAGRAMS

9
8

7
6

PIN 5: GROUND

4

PIN 3: DATA OUT

PIN 2: DATA IN

1

DB-9

Serial Connector

(Female Pin Contacts)

(-)

(+)

Power Source

Fuse
1A

GPS 15

Computer Serial Port

Interconnection

(1) WHITE: BACKUP POWER
(2) BLACK: GROUND
(3) RED: POWER
(4) YELLOW: PORT 1 DATA OUT
(5) BLUE: PORT 1 DATA IN
(6) ORANGE: RF BIAS

Figure 1. Computer Serial Port Interconnection

(-)

(+)

Power Source

Fuse
1A

GPS 15

PDA Serial Port
Interconnection

GPS 15

Power/Data Cable

1

6
7
8
9

PIN 2: DATA OUT

PIN 3: DATA IN

4

PIN 5: GROUND

Serial Connector

(Male Pin Contacts)

Host Application

NMEA Device

DB-9

(1) WHITE: BACKUP POWER
(2) BLACK: GROUND
(3) RED: POWER
(4) YELLOW: PORT 1 DATA OUT
(5) BLUE: PORT 1 DATA IN
(6) ORANGE: RF BIAS

Figure 2. PDA Serial Port Interconnection

(-)

(+)

Power Source

POWER
GROUND

DATA OUT

DATA IN

Fuse
1A

(1) WHITE: BACKUP POWER
(2) BLACK: GROUND
(3) RED: POWER
(4) YELLOW: PORT 1 DATA OUT
(5) BLUE: PORT 1 DATA IN
(6) ORANGE: RF BIAS

GPS 15

Basic Interconnection

GPS 15

Power/Data Cable

GPS 15

Power/Data Cable

Figure 3. Basic NMEA Device Interconnection

GPS 15 TECHNICAL SPECIFICATIONS Page 7
P/N 190-00266-00 Rev. A

3 SOFTWARE INTERFACE

The GPS 15 interface protocol design on COM 1 is based on the National Marine Electronics Association’s
NMEA 0183 ASCII interface specification. This standard is fully defined in “NMEA 0183, Version 3.0”
(copies may be obtained from NMEA, www.nmea.org).

The GPS 15 interface protocol, in addition to transmitting navigation information as defined by
NMEA˚0183, transmits additional information using the convention of GARMIN proprietary sentences.

The following sections describe the NMEA 0183 data format of each sentence transmitted and received by
the GPS 15.

3.1

RECEIVED NMEA 0183 SENTENCES

The subsequent paragraphs define the sentences that can be received on the GPS sensors’ COM 1 port. Null
fields in the configuration sentence indicate no change in the particular configuration parameter. All
sentences received by the GPS sensor must be terminated with <CR><LF>, the ASCII characters for
carriage return (0D hexadecimal) and line feed (0A hexadecimal). The checksum *hh is used for parity
checking data and is not required, but is recommended for use in environments containing high
electromagnetic noise. It is generally not required in normal PC environments. When used, the parity bytes
(hh) are the ASCII representation of the exclusive-or (XOR) sum of all the characters between the "$” and
“*” characters, non-inclusive. Sentences may be truncated by <CR><LF> after any data field and valid
fields up to that point will be acted on by the GPS sensor.

3.1.1 Sensor Initialization Information (PGRMI)

The $PGRMI sentence provides information used to initialize the GPS sensor’s set position and time used
for satellite acquisition. Receipt of this sentence by the GPS sensor causes the software to restart the
satellite acquisition process. If there are no errors in the sentence, it will be echoed upon receipt. If an
error is detected, the echoed PGRMI sentence will contain the current default values. Current PGRMI
defaults (with the exception of the Receiver Command, which is a command rather than a mode) can also be
obtained by sending $PGRMIE to the GPS sensor.

$PGRMI,<1>,<2>,<3>,<4>,<5>,<6>,<7>*hh<CR><LF>

<1> Latitude, ddmm.mmm format (leading zeros must be transmitted)
<2> Latitude hemisphere, N or S
<3> Longitude, dddmm.mmm format (leading zeros must be transmitted)
<4> Longitude hemisphere, E or W
<5> Current UTC date, ddmmyy format
<6> Current UTC time, hhmmss format
<7> Receiver Command, A = Auto Locate, R = Unit Reset

Page 8 GPS 15 TECHNICAL SPECIFICATIONS
Rev. A P/N 190-00266-00

3.1.2 Sensor Configuration Information (PGRMC)

The $PGRMC sentence provides information used to configure the GPS sensor’s operation. Configuration
parameters are stored in non-volatile memory and retained between power cycles. The GPS sensor will
echo this sentence upon its receipt if no errors are detected. If an error is detected, the echoed PGRMC
sentence will contain the current default values. Current default values can also be obtained by sending
$PGRMCE to the GPS sensor.

$PGRMC,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>,<13>,<14>*hh<CR><LF>

<1> Fix mode, A = automatic, 2 = 2D exclusively (host system must supply altitude),

3 = 3D exclusively
<2> Altitude above/below mean sea level, -1500.0 to 18000.0 meters
<3> Earth datum index. If the user datum index (96) is specified, fields <4> through <8> must contain

valid values. Otherwise, fields <4> through <8> must be null. Refer to Appendix A for a list of

earth datums and the corresponding earth datum index.
<4> User earth datum semi-major axis, 6360000.000 to 6380000.000 meters (.001 meters resolution)
<5>

User earth datum inverse flattening factor, 285.0 to 310.0 (10
<6> User earth datum delta x earth centered coordinate, -5000.0 to 5000.0 meters (1 meter resolution)
<7> User earth datum delta y earth centered coordinate, -5000.0 to 5000.0 meters (1 meter resolution)
<8> User earth datum delta z earth centered coordinate, -5000.0 to 5000.0 meters (1 meter resolution)
<9> Not used.

<10> Not used.
<11> Velocity filter, 0 = No filter, 1 = Automatic filter, 2-255 = Filter time constant

(e.g., 10 = 10 second filter)

<12> Not used.
<13> Not used.
<14> Dead reckoning valid time 1-30 (sec)

-9

resolution)

All configuration changes take effect after receipt of a valid value.

3.1.3 Miscellaneous Commands (PGRMO)

The $PGRMO sentence provides the ability to change between normal and power save modes, as well as
select Garmin data format for the remainder of the power cycle.

$PGRMO,<1>,<2>*hh<CR><LF>

<1> Not used.
<2> Command, where:

B = change to power save mode.
G = change to Garmin proprietary data format for the remainder of the power cycle.
N = change to normal (as opposed to power save) mode.

GPS 15 TECHNICAL SPECIFICATIONS Page 9
P/N 190-00266-00 Rev. A

3.2

TRANSMITTED NMEA 0183 SENTENCES

The subsequent paragraphs define the sentences that can be transmitted on COM 1 by the GPS sensor.

3.2.1 Sentence Transmission Rate

The GPS sensor will transmit each sentence (except where noted in particular transmitted sentence
descriptions) at a one-second rate. The GPS sensor will transmit the following sentences contiguously. The
contiguous transmission starts at a GPS second boundary. The information transmitted by the GPS sensor
is referenced to the GPS second boundary immediately preceding the GPRMC sentence.

Table 2. NMEA 0183 Output Sentence Order

Sentence Output by Default?

GPRMC
GPGGA

GPGSA

GPGSV
PGRME
PGRMT Once per minute

PGRMM

The maximum number of fields allowed in a single sentence is 82 characters including delimiters. Values
in the table include the sentence start delimiter character “$” and the termination delimiter <CR><LF>.
The factory set defaults will result in a once per second transmission at the NMEA 0183 specification
transmission rate of 4800 baud.

✔
✔
✔
✔
✔

✔

Page 10 GPS 15 TECHNICAL SPECIFICATIONS
Rev. A P/N 190-00266-00

3.2.2 Transmitted Time

The GPS sensor outputs UTC (Coordinated Universal Time) date and time of day in the transmitted
sentences. Prior to the initial position fix, the on-board clock provides the date and time of day. After the
initial position fix, the date and time of day are calculated using GPS satellite information.

The GPS sensor uses information obtained from the GPS satellites to add or delete UTC leap seconds and
correct the transmitted date and time of day. The transmitted date and time of day for leap second
correction follow the guidelines in “National Institute of Standards and Technology Special Publication
432 (Revised 1990)” (for sale by the Superintendent of Documents, U.S. Government Printing Office,
Washington, D.C., 20402, U.S.A.).

When a positive leap second is required, the second is inserted beginning at 23h 59m 60s of the last day of
a month and ending at 0h 0m 0s of the first day of the following month. The minute containing the leap
second is 61 seconds long. The GPS sensor would have transmitted this information for the leap second
added December 31, 1989 as follows:

Date Time
311289 235959
311289 235960

010190 000000
If a negative leap second should be required, one second will be deleted at the end of some UTC month.
The minute containing the leap second will be only 59 seconds long. In this case, the GPS sensor will not
transmit the time of day 23h 59m 59s for the day from which the leap second is removed.

3.2.3 Global Positioning System Fix Data (GGA)

$GPGGA,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,M,<10>,M,<11>,<12>*hh<CR><LF>

<1> UTC time of position fix, hhmmss format
<2> Latitude, ddmm.mmmm format (leading zeros will be transmitted)
<3> Latitude hemisphere, N or S
<4> Longitude, dddmm.mmmm format (leading zeros will be transmitted)
<5> Longitude hemisphere, E or W
<6> GPS quality indication, 0 = fix not available, 1 = Non-differential GPS fix available, 2 =

Differential GPS (DGPS) fix available, 6 = Estimated

<7> Number of satellites in use, 00 to 12 (leading zeros will be transmitted)
<8> Horizontal dilution of precision, 0.5 to 99.9

<9> Antenna height above/below mean sea level, -9999.9 to 99999.9 meters
<10> Geoidal height, -999.9 to 9999.9 meters
<11> Not used.
<12> Not used.

3.2.4 GPS DOP and Active Satellites (GSA)

$GPGSA,<1>,<2>,<3>,<3>,<3>,<3>,<3>,<3>,<3>,<3>,<3>,<3>,<3>,<3>,<4>,<5>,<6>*hh<CR><LF>

<1> Mode, M = manual, A = automatic

<2> Fix type, 1 = not available, 2 = 2D, 3 = 3D

<3> PRN number, 01 to 32, of satellite used in solution, up to 12 transmitted (leading zeros will be

transmitted)
<4> Position dilution of precision, 0.5 to 99.9
<5> Horizontal dilution of precision, 0.5 to 99.9
<6> Vertical dilution of precision, 0.5 to 99.9

GPS 15 TECHNICAL SPECIFICATIONS Page 11
P/N 190-00266-00 Rev. A

3.2.5 GPS Satellites in View (GSV)

$GPGSV,<1>,<2>,<3>,<4>,<5>,<6>,<7>,...<4>,<5>,<6>,<7>*hh<CR><LF>

<1> Total number of GSV sentences to be transmitted
<2> Number of current GSV sentence
<3> Total number of satellites in view, 00 to 12 (leading zeros will be transmitted)
<4> Satellite PRN number, 01 to 32 (leading zeros will be transmitted)
<5> Satellite elevation, 00 to 90 degrees (leading zeros will be transmitted)
<6> Satellite azimuth, 000 to 359 degrees, true (leading zeros will be transmitted)
<7> Signal to noise ratio (C/No) 00 to 99 dB, null when not tracking (leading zeros will be transmitted)

NOTE: Items <4>,<5>,<6> and <7> repeat for each satellite in view to a maximum of four (4) satellites
per sentence. Additional satellites in view information must be sent in subsequent bursts of NMEA 0183
data. These fields will be null if unused.

3.2.6 Recommended Minimum Specific GPS/TRANSI T Dat a (RMC)

$GPRMC,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>*hh<CR><LF>

<1> UTC time of position fix, hhmmss format
<2> Status, A = Valid position, V = NAV receiver warning
<3> Latitude, ddmm.mmmm format (leading zeros will be transmitted)
<4> Latitude hemisphere, N or S
<5> Longitude, dddmm.mmmm format (leading zeros will be transmitted)
<6> Longitude hemisphere, E or W
<7> Speed over ground, 000.0 to 999.9 knots (leading zeros will be transmitted)
<8> Course over ground, 000.0 to 359.9 degrees, true (leading zeros will be transmitted)
<9> UTC date of position fix, ddmmyy format

<10> Magnetic variation, 000.0 to 180.0 degrees (leading zeros will be transmitted)
<11> Magnetic variation direction, E or W (westerly variation adds to true course)
<12> Mode indicator, A = Autonomous, D = Differential, E = Estimated, N = Data not valid

3.2.7 Estimated Error Information (PGRME)

$PGRME,<1>,M,<2>,M,<3>,M*hh<CR><LF>

<1> Estimated horizontal position error (HPE), 0.0 to 999.9 meters
<2> Estimated vertical position error (VPE), 0.0 to 999.9 meters
<3> Estimated position error (EPE), 0.0 to 999.9 meters

3.2.8 Map Datum (PGRMM)

The GARMIN Proprietary sentence $PGRMM gives the name of the map datum currently in use by the
GPS sensor. This information is used by the GARMIN MapSource real-time plotting application.

$PGRMM,<1>*hh<CR><LF>

<1> Name of map datum currently in use (variable length field, e.g., “WGS 84”)

Page 12 GPS 15 TECHNICAL SPECIFICATIONS
Rev. A P/N 190-00266-00

3.2.9 Sensor Status Information (PGRMT)

The GARMIN Proprietary sentence $PGRMT gives information concerning the status of the GPS sensor.
This sentence is transmitted once per minute regardless of the selected baud rate.

$PGRMT,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>*hh<CR><LF>

<1> Product, model and software version (variable length field, e.g., “GPS 17 VER 2.05”)
<2> ROM checksum test, P = pass, F = fail
<3> Receiver failure discrete, P = pass, F = fail
<4> Stored data lost, R = retained, L = lost
<5> Real time clock lost, R = retained, L = lost
<6> Oscillator drift discrete, P = pass, F = excessive drift detected
<7> Data collection discrete, C = collecting, null if not collecting
<8> GPS sensor temperature in degrees C
<9> Not used.

GPS 15 TECHNICAL SPECIFICATIONS Page 13
P/N 190-00266-00 Rev. A

4 MECHANICAL CHARACTERISTICS & MOUNTING

.167

4.24

.198

5.04

.081

2.06

.177

4.50

PIN 1

.105

2.67

DETAIL A

SCALE 3 : 1

.047

1.19

.037

0.94

.142

3.60

.309

7.84

A

1.387

35.22

.940

23.88

1.490

37.85

.432

10.97

1.690

42.93

NOTES:

1. DIMENSIONS IN MILLIMETERS [INCHES].

2. DIMENSION TOLERENCES: 0.25mm [ 0.10"].

3. USE M2 MOUNTING SCREWS.

Figure 4. GPS 15-F Dimensions

PIN 1

NOTES:

1. DIMENSIONS IDENTICAL TO GPS 15-F.

2. USE M2 MOUNTING SCREWS.

.110

2.79

.735

18.67

Figure 5. GPS 15-W Outline Drawing

Page 14 GPS 15 TECHNICAL SPECIFICATIONS
Rev. A P/N 190-00266-00

Appendix A

Earth Datums

The following is a list of the GARMIN GPS 15 earth datum indices and the corresponding earth datum
name (including the area of application):

0 ADINDAN - Ethiopia, Mali, Senegal, Sudan
1 AFGOOYE - Somalia
2 AIN EL ABD 1970 - Bahrain Island, Saudi Arabia
3 ANNA 1 ASTRO 1965 - Cocos Island
4 ARC 1950 - Botswana, Lesotho, Malawi, Swaziland, Zaire, Zambia, Zimbabwe
5 ARC 1960 - Kenya, Tanzania
6 ASCENSION ISLAND 1958 - Ascension Island
7 ASTRO BEACON “E” - Iwo Jima Island
8 AUSTRALIAN GEODETIC 1966 - Australia, Tasmania Island
9 AUSTRALIAN GEODETIC 1984 - Australia, Tasmania Island
10 ASTRO DOS 71/4 - St. Helena Island
11 ASTRONOMIC STATION 1952 - Marcus Island
12 ASTRO B4 SOROL ATOLL - Tern Island
13 BELLEVUE (IGN) - Efate and Erromango Islands
14 BERMUDA 1957 - Bermuda Islands
15 BOGOTA OBSERVATORY - Colombia
16 CAMPO INCHAUSPE - Argentina
17 CANTON ASTRO 1966 - Phoenix Islands
18 CAPE CANAVERAL - Florida, Bahama Islands
19 CAPE - South Africa
20 CARTHAGE - Tunisia
21 CHATHAM 1971 - Chatham Island (New Zealand)
22 CHUA ASTRO - Paraguay
23 CORREGO ALEGRE - Brazil
24 DJAKARTA (BATAVIA) - Sumatra Island (Indonesia)
25 DOS 1968 - Gizo Island (New Georgia Islands)
26 EASTER ISLAND 1967 - Easter Island
27 EUROPEAN 1950 - Austria, Belgium, Denmark, Finland, France, Germany, Gibraltar, Greece,

Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland

28 EUROPEAN 1979 - Austria, Finland, Netherlands, Norway, Spain, Sweden, Switzerland
29 FINLAND HAYFORD 1910 - Finland
30 GANDAJIKA BASE - Republic of Maldives
31 GEODETIC DATUM 1949 - New Zealand
32 ORDNANCE SURVEY OF GREAT BRITAIN 1936 - England, Isle of Man, Scotland, Shetland

Islands, Wales

33 GUAM 1963 - Guam Island
34 GUX 1 ASTRO - Guadalcanal Island
35 HJORSEY 1955 - Iceland
36 HONG KONG 1963 - Hong Kong
37 INDIAN - Bangladesh, India, Nepal
38 INDIAN - Thailand, Vietnam
39 IRELAND 1965 - Ireland
40 ISTS O73 ASTRO 1969 - Diego Garcia
41 JOHNSTON ISLAND 1961 - Johnston Island
42 KANDAWALA - Sri Lanka
43 KERGUELEN ISLAND - Kerguelen Island
44 KERTAU 1948 - West Malaysia, Singapore

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45 L.C. 5 ASTRO - Cayman Brac Island
46 LIBERIA 1964 - Liberia
47 LUZON - Mindanao Island
48 LUZON - Phillippines (excluding Mindanao Island)
49 MAHE 1971 - Mahe Island
50 MARCO ASTRO - Salvage Islands
51 MASSAWA - Eritrea (Ethiopia)
52 MERCHICH - Morocco
53 MIDWAY ASTRO 1961 - Midway Island
54 MINNA - Nigeria
55 NORTH AMERICAN 1927 - Alaska
56 NORTH AMERICAN 1927 - Bahamas (excluding San Salvador Island)
57 NORTH AMERICAN 1927 - Central America (Belize, Costa Rica, El Salvador, Guatemala,

Honduras, Nicaragua)

58 NORTH AMERICAN 1927 - Canal Zone
59 NORTH AMERICAN 1927 - Canada (including Newfoundland Island)
60 NORTH AMERICAN 1927 - Caribbean (Barbados, Caicos Islands, Cuba, Dominican Republic,

Grand Cayman, Jamaica, Leeward Islands, Turks Islands)

61 NORTH AMERICAN 1927 - Mean Value (CONUS)
62 NORTH AMERICAN 1927 - Cuba
63 NORTH AMERICAN 1927 - Greenland (Hayes Peninsula)
64 NORTH AMERICAN 1927 - Mexico
65 NORTH AMERICAN 1927 - San Salvador Island
66 NORTH AMERICAN 1983 - Alaska, Canada, Central America, CONUS, Mexico
67 NAPARIMA, BWI - Trinidad and Tobago
68 NAHRWAN - Masirah Island (Oman)
69 NAHRWAN - Saudi Arabia
70 NAHRWAN - United Arab Emirates
71 OBSERVATORIO 1966 - Corvo and Flores Islands (Azores)
72 OLD EGYPTIAN - Egypt
73 OLD HAWAIIAN - Mean Value
74 OMAN - Oman
75 PICO DE LAS NIEVES - Canary Islands
76 PITCAIRN ASTRO 1967 - Pitcairn Island
77 PUERTO RICO - Puerto Rico, Virgin Islands
78 QATAR NATIONAL - Qatar
79 QORNOQ - South Greenland
80 REUNION - Mascarene Island
81 ROME 1940 - Sardinia Island
82 RT 90 - Sweden
83 PROVISIONAL SOUTH AMERICAN 1956 - Bolivia, Chile, Colombia, Ecuador, Guyana, Peru,

Venezuela

84 SOUTH AMERICAN 1969 - Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana,

Paraguay, Peru, Venezuela, Trinidad and Tobago

85 SOUTH ASIA - Singapore
86 PROVISIONAL SOUTH CHILEAN 1963 - South Chile
87 SANTO (DOS) - Espirito Santo Island
88 SAO BRAZ - Sao Miguel, Santa Maria Islands (Azores)
89 SAPPER HILL 1943 - East Falkland Island
90 SCHWARZECK - Namibia
91 SOUTHEAST BASE - Porto Santo and Madeira Islands
92 SOUTHWEST BASE - Faial, Graciosa, Pico, Sao Jorge, and Terceira Islands (Azores)
93 TIMBALAI 1948 - Brunei and East Malaysia (Sarawak and Sabah)
94 TOKYO - Japan, Korea, Okinawa
95 TRISTAN ASTRO 1968 - Tristan da Cunha
96 User defined earth datum
97 VITI LEVU 1916 - Viti Levu Island (Fiji Islands)

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98 WAKE-ENIWETOK 1960 - Marshall Islands
99 WORLD GEODETIC SYSTEM 1972
100 WORLD GEODETIC SYSTEM 1984
101 ZANDERIJ - Surinam
102 CH-1903 - Switzerland
103 Hu - Tzu - Shan
104 Indonesia 74
105 Austria
106 Potsdam
107 Taiwan - modified Hu-Tzu-Shan
108 GDA - Geocentric Datum of Australia
109 Dutch

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