Garmin GDL 30A Owner's Manual - Page 19

XM WX Weather Features Sea Surface The Sea Surface category contains Temperature, Wave Height, Wave Period, and Wave Direction. Each feature can be turned on or off, or set to display at a selected zoom range. For more information on configuring units of measure for Temperature and Wave Height, see the chartplotter Owner's Manual. Temperature The Temperature feature displays the water surface temperature. The temperature breaks are indicated by isobars. Temperature can be displayed in degrees Fahrenheit (°F) or in degrees Celcius (°C). Wave Height The Wave Height feature displays wave heights. The wave heights for an area are separated by isobars. Wave Height can be displayed in feet (ft.) or meters (m). Temperature Feature Wave Height Feature GDL 30A Owner's Manual 17