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72 GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > COMM TAB
Comm (Communications) Tab
The Communications tab controls the input/output format used
when connecting your GPSMAP 188/188C Sounder to external
NMEA devices, a DGPS beacon receiver, a personal computer, or
another Garmin unit.
NOTE: If a DGPS receiver is used, WAAS capability is
automatically turned to off. See pages 98 and 99 for wiring and
NMEA version information.
The unit supports two input/output ports.
Port 1
• Garmin Data Transfer—the proprietary format used to
upload/download MapSource data, exchange waypoint,
route, track, almanac, and proximity data with a PC or
another Garmin unit. When you select Garmin Data
Transfer, there are 11 Transfer Modes to choose from:
Host, Request Almanac, Request Proximity, Request Routes,
Request Tracks, Request Waypoints, Send Almanac, Send
Proximity, Send Routes, Send Tracks, and Send Waypoints.
• NMEA In/NMEA Out—supports the input/output of
standard NMEA 0183 data, and sonar NMEA input support
for the DPT, MTW, and VHW sentences.
• None—provides no interfacing capabilities.
Port 2
• Garmin DGPS—supports connections with a Garmin DGPS
beacon receiver.
• Other DGPS—supports DGPS input using a standard
RTCM format, without any output capabilities.
• NMEA In/NMEA Out—supports the input/output of
standard NMEA 0183 data, and sonar NMEA support for the
DBT, DPT, MTW, and VHW sentences. You can also adjust
the NMEA output.
• RTCM In/NMEA Out—supports Differential GPS (DGPS)
input using a standard RTCM format and also provides
NMEA 0183 output.
• None—provides no interfacing capabilities.
NOTE: The GPSMAP 188/188C can only send DBT and DPT
NMEA sentences. It cannot input DBT and DPT sentences.