Wave Period; Wave Direction - Garmin GDL 30A Owner's Manual

Sea Surface Features
This map displays all four sea surface features. To avoid
a cluttered look, try zooming in to a specifi c area so
that the weather data will display farther apart. Or,
consider displaying fewer features at the same time.
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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 a wave is moving, as indicated by the direction
of the red arrow.
Wave Period feature Wave Direction feature