Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Autopilot installation manual
- Rudder-angle display
- Helm access
Step-by-step instructions
Identify the sensor arrangement
Confirm whether your autopilot uses a separate rudder reference and where it is physically mounted.
Observe rudder readings at the dock
With the system in a safe non-driving mode, compare reported angle with known center and small manual helm movements.
Look for inconsistent movement
Note jumps, reversals, dead zones or readings that change without rudder motion.
Inspect accessible linkages
With the steering secured and no moving load, check for obvious loose brackets or chafed visible wiring.
Arrange model-specific calibration
Follow the correct manufacturer procedure only after mechanical faults are corrected.
Safety note
Steering linkages can pinch or move unexpectedly. Do not reach into an active steering compartment or trust a suspect autopilot at sea.
Key takeaway
Sensor faults can imitate a tuning problem that no gain adjustment will cure.
Keep this job on your maintenance schedule
Save the topic as a maintenance task, choose a due date or engine-hour target, and record future service. Free and stored on your device.
Add to my maintenance plannerThis guide is for general education. Follow your equipment manufacturer’s instructions, current navigation guidance and applicable marine safety standards. When uncertain, use a qualified marine professional.