Airmar ST800PV-N2 NMEA 2000 Speed Temp Transducer [ST800PV-N2]ST800PV N2 NMEA 2000 Speed & Temp Transducer The ST800 speed and temperature sensor process digital signals inside the thru hull housing. Then this Smart Sensor sends data to a chart plotter, radar screen, or digital display in either analog or NMEA 2000 format. These low profile units are nearly flush, minimizing drag with only 5 mm (3 16") extending outside of the hull. Features: Speed and fast response water temperature sensing Speed range from 2