Easily attach your compatible 4-, 8- or 12-pin transducer to the step of your boat with this mount, which provides excellent sonar returns at low speeds. The mount protects the transducer from underwater obstructions and creates no drag on the boat. And since the transducer is out of the water, sonar will not track bottom when the boat is on plane.Compatible Devices:All-in-one HD-ID and DownVu Transducer (4-pin)All-in-one HD-ID and DownVu Transducer (8-pin)DownVu/SideVu Transducer (12-pin)echo 151dvecho 201dvecho 301dvecho 551dvechoMAP 50dvechoMAP 70dvGCV 10GPSMAP 1020xsGPSMAP 1040xsGPSMAP 820xsGPSMAP 840xs