This speed sensor from Humminbird is designed for consistent, frequent use with various Humminbird fishfinders, and can read speed ranges between 2 and 70 MPH. The unit features a transom mount and comes equipped with a 20 inch long cable.

Specifications and Features:
Optional speed sensor for Humminbird fishfinders
Provides quick response to changes
Reads from 2 to 70 MPH for speed
Transom mount
20 foot cable included
20 foot cable included