Raymarine Rotary Rudder Reference - M81105

The Raymarine Rotary Rudder Reference (Model M81105) is a rudder position transducer designed to deliver precise rudder angle feedback to your boat’s autopilot and instrument systems. As a marine-grade rotary sensor, it accurately measures the angle of the rudder or steering unit and sends that real-time data to the autopilot’s course computer or rudder angle display. This essential feedback helps your autopilot maintain correct heading, improve course keeping, reduce excessive steering corrections, and provide rudder angle readouts to displays and instruments. It comes complete with a 10 m (33 ft) marine-grade cable and mounting hardware for versatile installation in a variety of vessel setups. 

🔧 Technical Specifications

• Model: Raymarine Rotary Rudder Reference Transducer (M81105) 

• Type: Rotary rudder position transducer / rudder angle sensor 

• Output: Analog rudder angle signal to autopilot or instrument network 

• Cable: 10 m (33 ft) marine-grade cable included 

• Mounting Hardware: Included for rudder shaft or steering linkage installation 

• Construction: Marine-grade, weatherproof design for saltwater environments 

• Compatibility:

  • Raymarine autopilot systems

  • Autohelm/legacy autopilots

  • SeaTalk1/ST60+ rudder angle indicators

  • SeaTalk ng instruments via iTC-5 converter (sold separately) 

• Application: Rudder feedback for autopilot course correction and rudder angle display 

⭐ Key Features

• Accurate Rudder Angle Feedback: Provides real-time rudder position data to the autopilot course computer, enabling smoother steering and better course holding. 

• Rotary Magnetic Sensing: Contactless sensor reduces mechanical wear and enhances reliability over time. 

• Easy Integration: Works with legacy Raymarine and Autohelm systems, and with modern SeaTalk ng displays when used with an appropriate converter. 

• Marine-Grade Build: Weather-resistant construction built to withstand exposure to marine environments and corrosion. 

• Complete Kit: Includes mounting hardware and a long cable for flexible routing. 

• Improved Autopilot Performance: With true rudder position feedback, autopilots make better steering corrections — particularly useful in challenging sea conditions.