The 220WX has an internal, 10 Hz GPS and a three-axis electronic compass.
Airmar 220WX WeatherStation® Instrument with Heater - No Relative Humidity The Airmar 220WX WeatherStation® Feature-rich in a durable, rugged, small footprint that is IPX6 rated, the 220WX calculates the theoretical wind speed and direction based on the apparent wind, speed of the vessel, and vessel heading.