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Product DescriptionEasily collect your vessel speed and the water temperature with the Garmin Airmar ST850 speed/temperature sensor. Digital signal processing inside the housing provides speed and temperature data to a chartplotter, radar screen, or digital display in either analog or NMEA 2000 formats. This low-profile unit is nearly flush with only 3/16" extending outside of the hull. Plastic thru-hull mount sensor uses a paddlewheel to determine vessel speed while the temperature sensor indicates the current water temperature. The 8-pin Airmar ST850 sensor works on compatible Garmin sounders. It fits any deadrise/transom angles.