Garmin GT40-TM - TM DownV&252;/SideV&252; 500W (Chirp 455/800 kHz) Traditional 500W (77/200 kHz) Transducer w/Temp (55466) Garmin GT40-TM - TM DownV&252;/SideV&252; 500W (CHIRP 455/800 kHz) Traditional 500W (77/200 kHz) Transducer w/Temp (55466)