Garmin GDL 30 - Manual (Page 19)

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
t
he
w
eather
F
eatures