Garmin GXM 30A - Manual (Page 34)

 GXM 30A XM Radio Smart Antenna Owner’s Manual
TAF
Terminal Aerodrome Forecasts are issued by the National
Weather Service for pilots. They include 24-hour forecasts on
wind, visibility, expected weather conditions, and wind shear.
XM Radio
The XM Audio feature requires a subscription to XM Radio.
Channels can be scanned by category and saved to a Favorites
list. The XM audio output can be turned on and off.
Terminal Aerodrome Forecast
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Category
Channel list
Current song