Garmin GDL 30A Owner's Manual - Page 20

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Garmin GDL 30A Owner's Manual
XM WX Weather Features

Wave Period

The Wave Period feature provides the time (in seconds) between successive waves.

Wave Direction

The Wave Direction feature shows the direction in which waves are moving, as indicated by the direction of the red arrows.
Wave Period Feature
Wave Direction Feature
GDL 30A Owner's Manual