Say Goodbye to cleaning and replacing speed paddlewheels, and say Hello to Ultrasonic Speed from AIRMAR. The New UDST800 replaces your old speed transducer with ultrasonic speed calibration plus depth and water temperature. There are no moving parts to corrode or wear out, so you’ll have less time scraping and cleaning and more time for cruising fun. Ultrasonic is a proven technology for accurately measuring Speed Through Water (STW) and our new sensor calculates speed up to 22 times per second. That data is delivered to your NMEA2000® network or NMEA 0183 instruments up to 10 times per second. Watch the video for more information on the new UDST800 Speed Sensor from AIRMAR Technology.