Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Autopilot manual
- Sea-state notes
- Rudder-angle data
Step-by-step instructions
Record the exact behavior
Note mode, set course, wave conditions, boat speed and whether turns alternate repeatedly.
Reduce sail imbalance
Assess excessive weather helm and heel before changing autopilot sensitivity.
Check heading information
Compare compass heading, rate-of-turn indications and sensor warnings.
Inspect steering feedback
If fitted, review rudder reference readings and the visible drive system with the system safely off.
Follow model-specific setup
Calibrate and tune only under manufacturer guidance and in open, safe water.
Safety note
An autopilot that suddenly steers erratically can create collision or grounding risk. Take manual control promptly.
Key takeaway
A steering problem, sensor issue and aggressive gain setting can produce similar S-turns.
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.