Garmin GPS III Plus User Manual download pdf (Page 98)

Interfacing formats are selected from the Setup Menu, described on page 84. The input/output

lines on your GPS III+ are RS-232 compatible allowing easy interface to a wide range of external

devices, including PCs, differential beacon receivers, marine autopilots and/or a second GPS

receiver

The NMEA 0183 version 2.0 interface format is supported by the GPS III+ and enables the

unit to drive up to three NMEA devices:

NMEA 0183 version 2.0 Approved sentences:

GPGGA, GPGLL, GPGSA, GPGSV, GPRMB, GPRMC, GPRTE, GPWPL, GPBOD

Proprietary sentences:

PGRME (estimated error), PGRMM (map datum), PGRMZ (altitude), PSLIB (beacon receiver

control)

DGPS (Differential GPS) corrections are accepted in RTCM SC-104 version 2.0 format through

the Data In line. A GARMIN Differential Beacon Receiver (such as the GBR 21 or GBR 23) is

recommended for use with the GPS III+. Other beacon receivers with the correct RTCM format may

be used, but may not correctly display status or allow tuning control from the GPS unit.

The GPS III+ may be hard-wired to a

vehicle’s electrical system (10-32 VDC) using

an optional Power/Data Cable. Consult the

diagram to the left for proper connections.

(The male connector on the back of the GPS

III+ is illustrated.) A cigarette lighter adapter

is also available to power your GPS III+

without making permanent connections.

Additional cables are available for the

GPS III+. Contact your GARMIN dealer or

visit the GARMIN web site (www.garmin.com)

for additional accessories.

APPENDIX C

Interfacing / Wiring

(+) Power

(-) Ground

Data In Data Out

GPS III+ Connections (from back of unit)

Complete information concerning

NMEA & RTCM formats and

sentences is available for purchase

from NMEA at:

NMEA

PO Box 3435

New Bern, NC 28564-3435

U.S.A.

252-638-2626

252-638-4885 FAX

www.nmea.org

Radio Technical Commission For

Maritime Services (RTCM)

1800 Diagonal Road, Suite 600

Alexandria, VA 22314-2480

U.S.A.

703-684-4481 (Info Only)

703-836-4229 FAX

www.rtcm.org

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Garmin GPS III Plus User Manual Page 98

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