Garmin GWind Replacement Transducer Only. This Garmin gWind Twin-fin Transducer features twin-fin technology with 3-bladed propeller for more accurate TWS in lighter air while the twin-fin design gives a more stable TWA. The Garmin gWind 3-bladed Propeller Transducer will help improve reading accuracy and is even easy to replace when needed. Specifications for Garmin gWind Transducer Only: Manufacturer: Garmin Color: Black Package Contents: Garmin gWind 3-bladed Propeller Transducer Garmin 010-12117-20: GWind Replacement Transducer Only