Garmin gWind Transducer w/GND 10 Black Box Bridge [010-01227-00]gWind Transducer with GND 10 Black Box Bridge The Garmin gWind Transducer features twin fin technology with three bladed propeller for more accurate True Wind Speed (TWS) in lighter air while the twin fin design gives a more stable True Wind Angle (TWA). The three bladed propeller, unlike a cups design, is always efficient. Combined with optic reading this transducer provides superior accuracy at low wind speeds and also provides for excellent