Garmin GT51M-THGarmin GT51M TH Perfect for the coastal and offshore fisherman who want CHIRP traditional sonar, CHIRP ClearV and CHIRP SideV scanning sonar with a stainless steel stem, this thru hull mounted transducer consistently displays clear and crisp fish arches with superior target separation as well as clear pictures of objects, structure and fish that pass below and to each side of your boat and is optimized for rough sea conditions. The CHIRP ClearV SideV