Step 1: Check the Installation Kit 3Step 1Raymarine produces two alternative types of rudder sensor:• the rotary rudder position sensor is suitable for all steeringsystems (apart from ‘bullhorn’ style hydraulic outboards)• the linear rudder position sensor is specifically designed for‘bullhorn’ style hydraulic outboard steering systemsThe autopilot system – other key componentsDrive unitThe drive unit translates instructions from the course computer intorudder movement, so the course computer can steer the boat.Raymarine produces a wide range of drive units to suit different typesof steering systems.Control unitThe control unit is the your interface with the autopilot system. Youcan use it to:• engage and disengage the autopilot• adjust the boat’s course when the autopilot is engaged• view information about the autopilot system’s status and performa range of other functionsRaymarine produces a range of control units to suit different boatsand user requirements.The autopilot system – extended systemsAround these key components of the autopilot system, you canextend the system by adding options such as:• connections to additional control units, SeaTalk equipment orother manufacturers’ equipment (via NMEA)• a GyroPlus yaw sensor (if you have a Type 150 or Type 400course computer without a built-in GyroPlus) For more information, see page 22 For more information, see page 28 For more information, see page 29