Raymarine RV-220S RealVision 3D Starboard Side Thru-Hull CHIRP Bronze Transducer - 20 - 2M Cable [A80469]RV 220S RealVision 3D Starboard Side Thru Hull CHIRP Bronze Transducer 20 2M Cable Replacement transducer The RV 220 system features rugged cast bronze thru hull bodies suitable for fiberglass or wooden hulls. One transducer transmits and receives to port and downward, the other to starboard and downward, ensuring a full 180 of underwater coverage even on boats with deep keels or other underwater protrusions. Features: Gyro stabilized sonar