Garmin-Nexus NXR Solid state log Transducer, 25 ft. cable, TH52 2 in. thru-hull
The ultrasonic speed sensor makes cutting edge, high technology speed sensing affordable. Instead of a paddlewheel, it uses two transducers mounted in one compact housing to detect particles in the water and calculates speed based on their distance apart. The transducer reacts instantaneously to changes in boat speed.