18 GDL 30/30A Owner’s Manual
Sea Surface
The Sea Surface category contains Temperature, Wave Height, Wave Period, and Wave Direction. Each feature can be turned on, off or set to display at a selected zoom
range.
Temperature
The Temperature feature displays the water’s surface temperature. The temperature breaks are indicated by isobars.
Wave Height
The Wave Height feature displays wave heights. The wave heights for an area are separated by isobars.
Temperature feature
Wave Height feature
WEATHER FEATURES > SEA SURFACE—TEMPERATURE/WAVE HEIGHT
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