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GPSMAP 496 Owner’s Manual 161
Appendix > Installation Information
3. If the unit is on, a conrmation tone sounds. The rst time you
insert a programmed data card, the unit takes a few seconds to
read the card. When the data card has been properly installed
and accepted, a summary screen noting the card details
appears. Press ENTER to acknowledge.
If you insert a data card and get a card format not recognized
message, try removing the card and reinserting it. If the card is still
not recognized, contact Garmin Product Support or your Garmin
dealer.
To remove a data card:
1. Grasp the card handle. The handle expands for easy removal.
2. Pull the card out of the card slot on the bottom of the unit.
3. If the unit is on, a conrmation tone sounds when the data card is
removed.
Connecting the GXM 30A Antenna
Connect the GXM 30A antenna to the GPSMAP 496 to access XM
WX satellite weather and XM Radio. For more information about
the GXM 30A antenna, see the GXM 30A Owner’s Manual.
NOTE: You must subscribe to XM Radio and/or XM WX
Satellite Weather to use the XM Radio and/or XM Weather
features on your GPSMAP 496.
To connect the GXM 30A antenna:
1. Position the antenna where it has a clear view of the sky. This
can be on the outside of the vehicle or behind the windscreen.
2. Plug the GXM 30A cable into the USB port on the back of the
unit, as shown in the following illustrations.
GXM 30A Antenna Plugged In
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,
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,