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This little sensor is just such a handy add on feature to your Garmin Echo 200c 300c 500c 550c 201 301c 501c

Easily collect speed data and send it to your echo™ fishfinder with this water sensor.

Simply mount the speed sensor on the transom of your vessel and connect it to your device. The paddle wheel on the speed sensor turns as the vessel moves through the water, and speed data is collected and displayed on your device.