Garmin GPS III A Owner's Manual

Also see for GPS III: Declaration of conformity Quick guide Owner's manual Owner's manual

Garmin GPS III A Owner's Manual Manual pdf 86 page image

Interfacing formats are selected from the Setup Menu, described on page 67. Theinput/output lines on your GPS III are RS-232 compatible allowing easyinterface to a wide range of external devices, including PCs, differentialbeacon receivers, marine autopilots and/or a second GPS receiver.The NMEA 0183 version 2.0 interface format is supported by theGPS 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, GPBODProprietary sentences:PGRME (estimated error), PGRMM (map datum), PGRMZ(altitude), PSLIB (beacon receiver control)DGPS (Differential GPS) corrections are accepted in RTCM SC-104version 2.0 format through the Data In line. The GARMIN GBR 21 isthe recommended beacon receiver for use with the GPS III. Other beaconreceivers with the correct RTCM format may be used, but may not correct-ly display status or allow tuning control from the GPS unit.The GPS III may be hard-wired to a vehicle’s electrical system (10-32VDC) using an optional power/data cable. Consult the wiring diagram to theright for proper connections. (The male connector on the back of the GPSIII is illustrated.) A cigarette lighter adapter is also available to power yourGPS III without making permanent connections.Additional cables are available to connect your GPS III to a PC-compat-ible computer’s serial port (PC Interface Cable) or to connect to a secondGPS III (Data Cross-Load Cable). Contact your GARMIN dealer for any ofthese accessories.78APPENDIX CWiring / InterfacingGARMINGBR 21(+) Power(-) GroundData In Data OutGPS III Connections (from back of unit)GARMIN GBR 21 Beacon Receiver