Garmin GT21-TM Transom Mount Transducer, Traditional 600W, 50/200kHz, ClearVü CHIRP 500W, 260 & 455kHzTake coastal and offshore fishing to the next level with the Garmin GT21 TM Transom Mount Transducer. This dual technology transducer combines traditional sonar with CHIRP ClearV scanning to deliver clear arches, superior target separation, and sharp structure detail below your boat. Traditional sonar performance at 50 200 kHz provides deep water capability with up to 600 W, while the built in CHIRP ClearV element delivers high resolution scanning at