Garmin Accessory GT8HW-IH Xdcr 8pin HW-CHIRP In Hull. It requires a flat section (less than 6 degrees) in the hull to be mounted and is excellent for boats traveling at high speeds that want to maintain accurate depth readings.The 8-pin transducer features high-wide CHIRP traditional sonar (145-230 kHz) and has a power rating of 250 W. It can be used in conjunction with a GT30-TM transducer and an adapter cable so you can maintain depth at high speeds and scanning capabilities at trolling speeds. For installation follow the included instructions carefully to avoid damaging your boat. Specifications for Garmin GT8HW-IH Xdcr 8pin HW-CHIRP In Hull: Manufacturer: Garmin Color: Black Additional Features: 8 pin Features of Garmin GT8HW-IH Xdcr 8pin HW-CHIRP In Hull General Frequency:CHIRP High Wide (145-230 kHz) Power:250 W Beamwidth:24-16 Maximum depth:800 ft. freshwater Depth/Speed/Temperature:Depth Number of pins:8-pin Cable length:20 ft. Supported deadrise/Transom angles:0-6 deadrise Package Contents: Garmin GT8HW-IH Xdcr 8pin HW-CHIRP In Hull GT8HW-IHtransducer In-hull fitting Documentation Garmin 010-12401-10: Accessory GT8HW-IH Xdcr 8pin HW-CHIRP In Hull