Garmin gWind Race Transducer - Masthead Only [010-12117-30]gWind Race Transducer Masthead Only Designed for racing sailboats, the gWind Race features a 3. 3 feet (1 meter) straight pole to raise the transducer above the mast to remove turbulence errors. It 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 3 bladed propeller, unlike a cups design, is always efficient. This configuration includes only the gWind series