Garmin GPSMAP 378 Owner's Manual page 127

Connecting the Optional GXM 30 Antenna
Connect the optional GXM 30 antenna to the GPSMAP 378/478
to access XM WX satellite weather and XM Radio. For more
information about the GXM 30 antenna, see the GXM 30 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 378/478.
To connect the GXM 30 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 30 cable into the USB port on the back of the
unit, as shown in the following illustrations.
GPSMAP 378/478 Owner's Manual
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PPENDIX NSTALLATION
GXM 30 Antenna Plugged In
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NFORMATION
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