Garmin GT15M-IH 8 Pin In Hull TransducerGT15M IH transducer is ideal for boats that want to install the transducer inside a fiberglass hull and not on the transom where cavitation could cause issues. It can be used with a hull deadrise angle between 0 and 25 degrees 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 600 W.