Garmin GPSMAP 400 Weather and XM Satellite Radio - Manual (Page 18)

XM WX Satellite Weather and Cellular Weather
14 GPSMAP 400/500 Series Weather Supplement
Selecting a Cellular or XM Antenna
If your chartplotter is connected to both a cellular and an XM antenna, you
must select which antenna you want to provide weather service. If you are
connected to only one antenna, that antenna is selected automatically.
If you have both a cellular antenna and an XM antenna connected to your
chartplotter and you select the cellular antenna, XM weather data does not
appear, but your XM radio is still available (if you have a paid subscription).
If you select the XM antenna, cellular weather data does not appear.
1. From the Home screen, select Configure > Communications > NMeA
2000 Setup > Preferred Devices > Weather Antenna.
2. Select an antenna.
Selecting an External Cellular Antenna
If your chartplotter is connected to an external cellular antenna, you must
select that antenna on your chartplotter.
From the Home screen, select Configure > Communication > NMeA
2000 Setup > Device List > GDL 40 > Configure > GSM Antenna >
external.
Viewing Weather Subscription Information
You can view information about the weather services you have subscribed
to and how many minutes have passed since the data for each service was
updated. The time elapsed since the last weather download will be displayed
for cellular weather data. If you have purchased a day pass, the time of the
purchase and the time when the day pass expired is also shown.
From the Home screen, select Information > Weather > Weather
Subscription.