Davis Instruments Position Indicator Rudder. This is especially true while moving in and out of your berth drawing alongside another boat picking up a skier mooring or any other "close call" situation. Davis' Rudder Position Indicator gives instant visual reference of rudder angle. The pointer swings a full thirty degrees with each revolution of the wheel. Mounts directly to your hub (approximately 2" (5 cm) in diameter) with a self-adhesive pad . Rugged hermetically sealed weatherproof and sunproof housing ensures long life. No cables adjustments or electricity required; gravity power makes it simple and service-free. Suitable for boats with mechanical and single station hydraulic steering systems. Specifications for Davis Instruments Rudder Position Indicator: Manufacturer: Davis Instruments Color: Black Package Contents: Davis Instruments Rudder Position Indicator Davis Instruments 385: Position Indicator Rudder