Garmin GPS III Plus - Manual (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.
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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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