Humminbird 7300211 SW Speed Sensor
The Humminbird SW Transom Mount Speed Sensor provides digital reading of your speed through the water, and allows you to activate the triplog features. The SW speed sensor comes with a 20-foot cable, mounts on your boat's transom mount, and has a speed range of 2- to 75-miles per hour. This kit is compatible with Humminbird's Matrix, and Fishfinder series, as well as their FF and 900-series sonar units.