Garmin GT8HW-IH In Hull CHIRP Transducer is designed to be mounted inside the hull of your boat. This 250 Watt Transducer can reach maximum depths of up to 800'. High Frequency CHIRPs from 150 kHz to 240 kHz and the Wide Beam allows more bottom coverage. Compatible with STRIKER 4cv, 5cv, 7cv, echomap CHIRP, 4Xcv, 5Xcv, GPSMAP xs Series Combos and GSD 25. Please note you must have a flat spot in your hull (less than a 6° deadrise) to accommodate this transducer.