The Simrad RF300 Rudder Feedback Unit provides a high resolution that contributes to the gentle yet accurate steering that Simrad autopilots are known for. The Simrad RF300 is a rugged unit designed to withstand the environment. Though virtual rudder feedback (VRF) is now available from Simrad for outboards and stern drive boats up to 40 ft., it is necessary to display rudder angle on your autopilot.