Garmin GPS 35 LP Manual

GPS 35/36 TracPakTM

GPS SMART ANTENNA

TECHNICAL SPECIFICATION

GARMIN

· 1200 E. 151st Street · Olathe, Kansas

66062 ·

(913) 397-8200 · (913) 397-8282 FAX

KS 66062

Allrightsreserved. Nopartofthismanualmaybereproduced

or transmitted in any form or by any means, electronic or

mechanical,includingphotocopyingandrecording,forany

purposewithouttheexpresswrittenpermissionofGARMIN.

Information in this document is subject to change without

notice. GARMIN reserves the right to change or improve

their products and to make changes in the content without

obligation to notify any person or organization of such

changes or improvements.

January, 1999 190-00104-00 Rev. D

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 35/36 is a precision

electronic NAVigation AID (NAVAID), any NAVAID can be

misused or misinterpreted, and therefore become unsafe.

Use the GPS 35/36 at your own risk. To reduce the risk,

carefullyreviewandunderstandallaspectsofthisTechnical

Manual before using the GPS 35/36. When in actual use,

carefully compare indications from the GPS 35/36 to all

availablenavigationsourcesincludingtheinformationfrom

other NAVAIDs, visual sightings, charts, etc. For safety,

always resolve any discrepancies before continuing

navigation.

NOTE

This device has been tested and found to comply with the

limits for a Class B digital device, pursuant to Part 15 of the

FCC Rules. Operation is subject to the following two

conditions: (1) This device may not cause harmful

interference,and(2)thisdevicemustacceptanyinterference

received, including interference that may cause undesired

operation.

Thisdevicegenerates,usesandcanradiateradiofrequency

energyand,ifnotinstalledandusedinaccordancewiththe

instructions, may cause harmful interference to radio

communications. However, there is no guarantee that

interference will not occur in a particular installation. If this

devicedoescauseharmfulinterferencetoradioortelevision

reception, which can be determined by turning the device

off and on, you are 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 this device and the

receiver.

· Connect this device to an outlet on a different circuit

than that to which the receiver is connected.

· Consult the dealer or an experienced radio/TV

technician for help.

This device contains no user-serviceable parts. Repairs

shouldonlybeperformedbyanauthorizedGARMINservice

center. Unauthorizedrepairsormodificationstothisdevice

could void your warranty and your authority to operate this

device under Part 15 regulations.

TABLE OF CONTENTS

1. Introduction 1

1.1 Overview 1

1.2 Features 2

1.3 Technical Specifications 2

1.4 Application 4

2. Operational Characteristics 5

2.1 Self Test 5

2.2 Initialization 5

2.3 Navigation 6

2.4 Satellite Data Collection 7

3. Hardware Interface 9

3.1 Mechanical Dimensions 9

3.2 Mounting Configurations and Options 11

3.3 Connection Wiring Description 15

4. Software Interface 17

4.1 NMEA Received Sentences 17

4.2 NMEA Transmitted Sentences 21

4.3 Baud Rate Selection 28

4.4 RTCM Received Data 29

A. Earth Datums A-1

SECTION 1

INTRODUCTION

1.1 OVERVIEW

The GARMIN GPS 35/36 is a complete GPS receiver,

including an embedded antenna, designed for a broad

spectrumofOEM(OriginalEquipmentManufacturer)system

applications. Based on the proven technology found in

other GARMIN 12 channel GPS receivers, the GPS 35/36

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 capability meets the

sensitivity requirements of land navigation as well as the

dynamics requirements of high performance aircraft.

The

GPS 35/36design utilizes the latest technology and

highlevelcircuitintegrationtoachievesuperiorperformance

whileminimizingspaceandpowerrequirements. Allcritical

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 35/36. This hardware capability

combinedwithsoftwareintelligencemakes theGPS 35/36

easy to integrate and use.

The GPS 35/36 is designed to withstand rugged operating

conditionsand iscompletelywater resistant. TheGPS35/

36 is a complete GPS receiver that requires minimal

additional components be supplied by an OEM or system

integrator. AminimumsystemmustprovidetheGPS35/36

with a source of power and a clear view of the GPS

satellites. ThesystemmaycommunicatewiththeGPS35/

36 via a choice of two RS-232 compatible full duplex

communicationchannels. Internalmemorybackupallows

theGPS35/36toretaincriticaldatasuchassatelliteorbital

parameters,lastposition,dateandtime. Enduserinterfaces

suchaskeyboardsanddisplaysareaddedbytheapplication

designer.

1.2 FEATURES

TheGPS35/36providesahostoffeaturesthatmakeiteasy

to integrate and use.

1) Full navigation accuracy provided by Standard

Positioning Service (SPS)

2) Compact design ideal for applications with minimal

space

3) High performance receiver tracks up to 12 satellites

whileprovidingfastfirstfixandlowpowerconsumption

4) Differential capability utilizes real-time RTCM

corrections producing 3-10 meter position accuracy

5) Internalclockandmemoryaresustainedbyamemory

backup battery or optional external standby power

6) User initialization is not required

7) Navigation mode (2D or 3D) may be configured by

the user

8) Two communication channels and user selectable

baud rates allow maximum interface capability and

flexibility

1.3 TECHNICAL SPECIFICATIONS

Specifications are subject to change without notice.

1.3.1 PhysicalCharacteristics

1) Single construction integrated antenna/receiver.

2) Weight: 4.4 oz, (124.5 g), not including cable

3) Size: 2.230"(w)x 3.796" (l)x1.047" (h), (56.64mm

x 96.42 mm x 26.60 mm)

1.3.2 EnvironmentalCharacteristics

1) Operating temperature: -30°C to +85°C (internal

temperature)

2) Storage temperature: -40°C to +90°C

1.3.3 ElectricalCharacteristics

1) Input voltage: 10 to 30 VDC, unregulated.

2) Typically draws 150 mA @ 12 VDC

3) Backup power: Internal 3V Lithium coin cell battery,

up to 10 year life

1.3.4 Performance

1) Tracks up to 12 satellites

2) Update rate: 1 second

3) Acquisition time

- 15 seconds warm (all data known)

- 45 seconds cold (initial position, time and

almanac known, ephemeris unknown)

- 5.0 minutes AutoLocateTM (almanac known, initial

position and time unknown)

- 5 minutes search the sky (no data known)

4) Position accuracy:

Differential GPS (DGPS): 5 meters RMS

Non-differentialGPS: 15metersRMS(100meters

with Selective Availability on)

5) Velocityaccuracy: 0.2m/sRMSsteadystate(subject

to Selective Availability)

6) Dynamics: 999 knots velocity, 6g dynamics

1.3.5 Interfaces

1) DualchannelRS-232compatiblewithuserselectable

baud rate (1200, 2400, 4800, 9600)

2) NMEA 0183 Version 2.0 ASCII output (GPALM,

GPGGA, GPGSA, GPGSV, GPRMC, GPVTG,

PGRME, PGRMT, PGRMV, PGRMF, LCGLL,

LCVTG)

Inputs

- Initial position, date and time (not required)

- Earth datum and differential mode configuration

command, almanac.

Outputs

- Position, velocity and time

- Receiver and satellite status

- Differential Reference Station ID and RTCM Data

age

- Geometry and error estimates

3) Real-timeDifferentialCorrectioninput(RTCMformat)

1.4 APPLICATION

TYPICAL APPLICATION ARCHITECTURE

SECTION 2

OPERATIONAL CHARACTERISTICS

Thissectiondescribesthebasicoperationalcharacteristics

of the GPS 35/36. Additional information regarding input

and output specifications are contained in Section 4.

2.1 SELF TEST

After input power has been applied to the GPS 35/36 and

periodically thereafter, the unit will perform critical self test

functionsandreporttheresultsovertheoutputchannel(s).

The following tests will be performed:

1) RAM check

2) ROM test

3) Receiver test

4) Real-time clock test

5) Oscillator check

In addition to the results of the above tests, the GPS 35/36

will report software version information.

2.2 INITIALIZATION

Aftertheinitialselftestiscomplete,theGPS35/36willbegin

the process of satellite acquisition and tracking. The

acquisition process is fully automatic and, under normal

circumstances, will take approximately 45 seconds to

achieve a position fix (15 seconds if ephemeris data is

known). After a position fix has been calculated, valid

position, velocity and time information will be transmitted

over the output channel(s).

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