The Davis Rudder Position Indicator gives instant visual reference of the rudder angle. This is important information, especially when moving in and out of your berth, drawing alongside another boat, picking up a skier, mooring, or any other "close call" situations. The Rudder Position Indicator has a pointer that swings a full 30° with each revolution on the steering wheel providing you with an easy-to-see reference point.The Indicator mounts directly to the hub of the boats steering wheel with a self-adhesive pad. Rugged, hermetically sealed, weatherproof, and sunproof housing ensures long life. Requires no cables, adjustments, or electricity. Gravity power makes it simple and service-free. Measures about 2" dia. Suitable for boats with mechanical and single station hydraulic steering systems.