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Know exactly how fast your boat is going with the SW Transom Mount Speed Sensor from Humminbird. The sensor securely mounts on your boat's transom and can tell your speed over water between 2 and 75 miles per hour. It interfaces with any existing Humminbird fishfinders, except those in the Wide Series. Simply attach the sensor's cord to your sounder unit using the attached connector, or an adapter if your model requires one.
Works with all Humminbird fishfinders other than the Wide series. Certain models may require an adaptor.