Garmin GDL 30 - Manual (Page 25)

GDL 30/30A Owner’s Manual 
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Setup
The Setup sub tab provides access to the three preset weather displays: General, Sea State, and Storms. The preset weather displays can be customized from this tab.
The Setup tab contains a map that displays any changes that are made. Legends for all weather conditions are also shown. For detailed information on customizing the
preset weather displays, see the chartplotter’s Owner’s Manual.