Garmin GPSMAP 175 Owner's Manual page 81

The following formats are supported for connection to up to 3 NMEA devices:
• NMEA 0180/NMEA 0182
• NMEA 0183 version 1.5
Approved sentences —
Proprietary sentences — PGRMM, PGRMZ (alt.), PSLIB
• NMEA 0183 version 2.0
Approved sentences —
Proprietary sentences — PGRME (estimated error), PGRMM
DGPS
DGPS corrections are accepted in RTCM-104 v. 2.0 format through the
NMEA In (BROWN) harness lead. The GARMIN GBR 21 is the
recommended beacon receiver for use with the GPSMAP system. Other
receivers with the correct RTCM format may be used, but may not correctly
display status or allow tuning control from the GPSMAP 175 unit.
APPENDIX
Wiring and Specifications
GPBWC, GPGLL, GPRMB, GPRMC,
GPXTE, GPVTG, GPWPL, GPBOD
(beacon receiver control input)
GPGGA, GPGSA, GPGSV, GPRMB,
GPRMC, GPRTE, GPWPL, GPBOD
(map datum)
PGRMZ (altitude), PSLIB
(beacon receiver control input)
The optional GARMIN GA 27 low-profile remote-
mount antenna is designed to be used with several
different GARMIN GPS units. To use this antenna with
the GPSMAP 175, simply plug the right-angle "MCX"
male connector on the end of the GA 27 cable into the
socket on the left side of the top of the unit.
Note: The GPSMAP 175 senses the electrical current
used by the GA27 in order to accept antenna input.
Antennas which do not use electrical input (such as the
GPS 45XL helix) will not function properly with the
GPSMAP 175.
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