Garmin GPSMAP 396 Owner's Manual page 169

RTCM SC-104 input (version 2.0), and Garmin proprietary formats
for connecting to a Mode S transponder for TIS data, and to a
Garmin aviation NAV/COM radio.
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,
PGRMM, and PGRMH.
The GPSMAP 396 also includes NMEA input with support for the
BWC, DBT, DPT, MTW, VHW, VTG, and XTE sentences.
Garmin's proprietary communication protocol is available from the
Web site (www.garmin.com).
Removing the GPS Antenna
You can remove the 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 396, refer to the installation instructions
that came with the antenna.
To remove the GPS antenna:
1. Remove the external power cable from the connector on the
back of the GPSMAP 396.
GPSMAP 396 Owner's Manual
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 396 unit.
Removing the GPS Antenna
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