Garmin gpsmap-188 User Manual

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NTERFACING

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