74 GPSMAP 176/176C Owner’s ManualM AIN MENU > SETUP TABInterface TabThe Interface tab allows you control the input/output format usedwhen connecting your GPSMAP 176/176C to external NMEAdevices, a DGPS beacon receiver, a personal computer, or anotherGarmin GPSMAP 176/176C.Interface TabNOTE: If a DGPS receiver is used, WAAS capability isautomatically turned Off.• Garmin Data Transfer—the proprietary format used toupload/download MapSource data, and exchange waypoint,route, track, almanac, and proximity data with a PC or anotherGarmin GPSMAP 176/176C. When you select Garmin DataTransfer, there are 11 Transfer Modes to choose from: Host,Request Almanac, Request Proximity, Request Routes, RequestTracks, Request Waypoints, Send Almanac, Send Proximity,Send Routes, Send Tracks, and Send Waypoints.• Garmin DGPS—used to connect the GPSMAP 176/176C witha Garmin DGPS beacon receiver.• NMEA In/NMEA Out—supports the input/output of standardNMEA 0183 version 2.3 data and sonar NMEA input supportfor the DPT, MTW, and VHW sentences.• Text Out—allows the unit to output simple text data thatincludes, data, time, position and velocity. The Baud can be setto 1200, 2400, 4800, or 9600bps.• RTCM In—allows Differential GPS (DGPS) input using astandard RTCM format.