A heading-control system uses the selected heading reference and steering interface to maintain a commanded heading. It must be distinguished from track control, which follows a planned track through a compatible navigation interface. An autopilot also differs from the steering gear and its manual controls: a fault in one does not establish that all three have failed.
Can poor heading keeping be caused outside the autopilot?
Yes. Heading input, rudder feedback and steering response affect the result. Record the selected mode and vessel operating conditions. A changing heading does not by itself identify an autopilot hardware fault.
Details that help assess this equipment
- Heading-source identity.
- Selected steering mode.
- Heading demand, actual heading and rudder response.
Equipment references and their scope
- Anschütz: NautoSteer AS — An example steering-control architecture; exact fitted variant determines function.
These references explain equipment or system examples. They do not establish the fitted configuration, SEANAV manufacturer authorization or a vessel’s acceptance limits. Use the installed model’s documentation for the actual work.
Related equipment guidance: Anschütz NautoSteer AS Steering Control — Service Assessment · Integrated Bridge Control and Monitoring Interfaces · Steering Gear Control Systems
Information and checks needed
- Confirm the active heading source and its validity indications. Compare source data at the sensor, interface and autopilot before changing settings.
- Inspect rudder-feedback agreement, command polarity and the configured steering interface against the approved drawings.
- Review active-station selection, mode changes, manual takeover and failure indications under the maker’s procedure.
- Assess alarm history, power supplies and the reported operating conditions. Poor heading keeping can involve sensor data, tuning, sea state, loading or mechanical steering condition.
Important limits
Do not prescribe one universal heading accuracy, rudder limit or calibration tolerance for every autopilot. Harbour functional checks and sea-trial assessment serve different purposes. Steering trials require bridge coordination and an agreed safe operating area.
Planning the service
Seanav Marine provides independent technical service support. Share the vessel and equipment details so the desk can confirm capability, the proposed scope, required parts, access and any manufacturer involvement. Review the reported symptoms and available records before deciding whether a field device, interface, supply or controller requires repair.
Agree isolation, operational restrictions and testing with the vessel before attendance. Preserve available configuration records and document any proposed wiring, software or parameter changes. Settings and acceptance criteria must follow the installed equipment documents rather than a generic service checklist.
Documentation and approval
The service record should identify the equipment, work performed, test method, results and unresolved defects. Routine maintenance, manufacturer-authorized work and statutory survey are different scopes. A service report does not issue or renew the ship’s statutory certificates, and no direct OEM agency is implied.
Changes affecting approved navigation, steering or emergency functions may need the appropriate manufacturer, owner, flag or recognized organization review. Confirm that requirement before modifying the installation. Maintenance intervals and test methods depend on the equipment and the vessel’s applicable requirements.
Request support
Send the vessel name and IMO number, equipment identification, port and ETA/ETD, fault description, alarm screenshots and relevant drawings or logs. Include any survey deadline. Attendance, parts and the service scope are subject to confirmation.
service@seanav.org · +971 58 568 1197 · Request an assessment
Primary references
- IMO: heading-control performance standards, MSC.64(67) Annex 3
- IMO: SOLAS convention and chapter scope
About this guide
Published by Seanav Marine. Editorial and source review: , AI-assisted. This general service guide is based on the references shown; it is not a signed vessel-specific engineering procedure. Equipment manuals and the responsible technical personnel determine the job requirements.
For technical assessment or a factual correction, contact Seanav Marine with the equipment identity and supporting documents.