The Garmin GT15M-IH transducer is ideal for boaters who want to install the transducer inside a fiberglass hull and not on the transom where cavitation could cause issues. The transducer can be used with a hull deadrise angle between 0° and 25° and is excellent for boats traveling at high speeds that want to maintain accurate depth readings. The 8-pin transducer with 4 plastic tanks features mid-band CHIRP traditional sonar (85-165 kHz) and has a power rating of 600W. 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. Maximum depth of 1, 900'. Great for boats traveling at high speeds Durable, marine-grade construction | GT15M-IH Plastic In-Hull Transducer