72 GPSMAP 198C Sounder Owner’s Manual
MAIN MENU > COMM TAB
Comm (Communications) Tab
The Comm tab controls the input/output format used when
connecting your GPSMAP 198C 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 99 and 100 for wiring
and NMEA version information.
The unit supports two input/output ports.
Port 1
• Garmin Data Transfer—is 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 input support
for the 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.
