Garmin GPSMAP 276C Owner's Manual - Page 114
Interfacing, Removing the GPS Antenna
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Appendix > Installation Information Interfacing The following formats are supported for connection of external devices: GARMIN proprietary Differential GPS (DGPS), NMEA 0180, 0182, 0183 (versions 1.5, 2.0, 2.3, 3.01), ASCII Text Output, and RTCM SC-104 input (version 2.0). The following are the Approved Sentences for NMEA 0183, version 3.01 output: GPRMC, GPGGA, GPGSA, GPGSV, GPGLL, GPBOD, GPRTE, and GPWPL. The following are the Proprietary Sentences for NMEA 0183, version 3.01 output: PGRME, PGRMZ, and PGRMM. The GPSMAP 276C also includes NMEA input with support for the BWC, DBT, DPT, DSC, DSE, MTW, VHW, VTG, and XTE sentences. Garmin's proprietary communication protocol is available from the Web site at www.garmin.com. Removing the GPS Antenna You can remove the GPS antenna to use an external antenna. After the antenna is removed, the BNC connector is exposed and ready for use with an external antenna. For information on connecting an external antenna to the GPSMAP 276C, refer to the installation instructions that came with the antenna. 106 To remove the GPS antenna: 1. Remove the external power cable from the connector on the back of the GPSMAP 276C. 2. Rotate the antenna to approximately a seven o'clock position. The alignment notches in the casing must line up with the notches on the antenna. 3. Pull the antenna away from the GPSMAP 276C unit. Removing the GPS Antenna GPSMAP 276C Owner's Manual