Raymarine - RV-220 RealVision 3D Bronze Thru-Hull Transducer Pair Pack - 20 - 8M Cable Y-Cable - T70319. Designed for inboard or outboard boats, the RV-220 Bronze Through Hull Transducer System lets you easily identify structures and locate fish with the life-like clarity of RealVision 3D sonar.. The RV-220 system is a 4-channel, Wide Spectrum CHIRP transducer system with DownVision, SideVision, high frequency CHIRP fish targeting and RealVision 3D sonar inside. The transducer system has a built-in attitude and heading reference system (AHRS) that stabilizes the sonar imagery, automatically compensating for vessel motion. You'll enjoy crystal-clear imagery in waves, swells, and while maneuvering. The RV-220 system also has a built-in fast response water temperature sensor for quick, accurate readings.. Raymarine's RV-220 Bronze Through Hull Transducer system pack contains a pair of RealVision 3D transducers with internal offset to accommodate hull deadrise angles from 13 to 20. This co