Garmin GXM 30A - Manual (Page 27)

GXM 30A XM Radio Smart Antenna Owner’s Manual 0
Buoy Reports
Report readings are taken from buoys and coastal observation stations. These readings are used to determine Air Temperature,
Dewpoint, Water Temperature, Tide, Wave Height and Period, Wind Direction and Speed, Visibility, and Barometric Pressure.
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Buoy Selected with map pointer Buoy report detail