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GPSMAP 188/188C Sounder Owner’s Manual 99
APPENDIX > INTERFACING
Interfacing
The following formats are supported for connection of external
devices:
Garmin proprietary Differential GPS (DGPS), NMEA 0183
versions 3.0, ASCII Text Output, RTCM SC-104 input (vs. 2.0).
The following are the sentences for NMEA 0183, vs. 3.0 output:
Approved sentences—GPRMC, GPGGA, GPGSA, GPGSV,
GPGLL, GPBOD, GPRTE, and GPWPL.
Proprietary sentences—PGRME, PGRMZ, and PSLIB. The
GPSMAP 188/188C Sounder accepts NMEA input with support for
the DBT, DPT, MTW, and VHW sentences.
The GPSMAP 188/188C Sounder also includes NMEA input with
support for the WPL sentence and sonar NMEA input with support
for the DPT (Depth), MTW (Water Temp) and VHW (Water Speed
& Heading) sentences. If connecting to COM 2 for sonar NMEA
input, the unit interface must be set to NMEA In/NMEA Out. If
connecting to COM 1, the unit must be set to NMEA In/NMEA
Out.
You can download a copy of Garmin’s proprietary communication
protocol on the Support section of our Web site at
www.garmin.com.
Complete information regarding NMEA and RTCM formats is
available for purchase at www.nmea.org