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GPSmap 76C
Interface Wiring Diagram
Appendices
Interface formats are selected from the Interface Setup on page 48 of
this manual. The input/output lines on your GPSmap 76C are RS-232
compatible, allowing easy interface to a wide range of external devices,
including PC’s, differential beacon receivers, marine autopilots, and /or a
second GPS receiver.
The NMEA 0183 version 3.01 interface format is supported by the
GPSmap 76C and enables the unit to drive up to three NMEA devices.
NMEA 0183 Version 3.01 Approved Sentences:
GPGGA, GPGLL, GPGSA, GPGSV, GPRMB, GPRMC, GPRTE, GPVTG,
GPWPL, GPBOD
Garmin Proprietary Sentences:
PGRME (estimated error), PGRMM (datum string), 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. The Garmin GBR 21 is the
recommended beacon receiver for use with the GPSmap 76C. 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 USB Interface Cable provided with
this unit allows you to connect your GPSmap
76C to a PC-compatible computer’s USB port.
Cable Plug End View
(-) Ground
Data Out
Data In
(+) Power
()
()
()
()
GPSmap 76C Owner's Guide copy.indd 81
3/25/2004, 11:32:21 AM
