Garmin GXM 30A - Manual (Page 9)

Connecting the GXM 30A to a Garmin Unit
Position the GXM 30A where is has a clear view of the sky. This can be on the outside of the vehicle or behind the windscreen of
the vehicle. Connect the GXM 30A to the USB port on the Garmin unit.
GXM 30 XM Radio Smart Antenna Owner’s Manual 
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