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Product DescriptionEasily collect speed data and send it to your device with this Garmin Water Speed Sensor. Simply mount the speed sensor on the transom of your vessel, and connect it to your sonar. 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. Speed sensor comes with an integrated Y-cable so you can add water speed to your GSD 26 sonar unit.