The drive is a rotary mechanical autopilot drive system which makes it simple and economical to fit an autopilot on smaller powerboats with mechanical push-pull cable steering. The drive unit is suitable for standard straight shaft configurations and incorporate a drive motor, solenoid clutch and integrated rudder feedback (RFB) capability. The compact drive unit completely replaces the existing manual steering helm and is totally concealed behind the dash, giving a neat, professional installation.