Autopilot Calibration: Steps and Tips

What calibration is and is not

Calibration is the setup process that makes an autopilot match the boat it steers. In general terms, it covers the heading sensor or compass so the autopilot knows which way the boat points, the rudder reference or feedback unit so it knows where the rudder is, and the drive unit so it moves the steering correctly. The aim is a system that responds the way your steering expects.

Calibration is not a step to improvise. The maker's manual is the source for the procedure, and a qualified installer or dealer is the right person to do it. Raymarine describes its Evolution series as self-calibrating on the maker's autopilot page, and Furuno describes the NavPilot series as self-learning and adaptive on its autopilot page. Those words describe how the software adjusts the system after setup, not a way to skip the manual.

When you buy a pack, the listing names the parts in the box, and the maker's page names the model line. Both help you know what calibration will touch. For a look at the current packs, see the best marine autopilot reviews.

The parts calibration touches

Autopilot calibration touches three main parts. The heading sensor tells the autopilot the boat's heading. The rudder reference reports the rudder position. The drive unit does the steering work; as Raymarine states on its drive unit page, the drive unit interfaces with the vessel's steering system to keep the boat on the right course.

Not every system needs all of these parts. Furuno states on the NavPilot 300 page that with Fantum Feedback, outboard and sterndrive installations no longer require a physical rudder feedback unit, using a time-based rudder gain process instead. The pack listing tells you which parts are in the box, and the maker's page tells you what a given model line requires.

• Heading sensor or compass: the part that reports the boat's heading.
• Rudder reference or feedback unit: the part that reports rudder position.
• Drive unit: the part that moves the steering, available as tiller, wheel, hydraulic pump, linear or rotary drive in the maker's catalog.
• Control head: the part you use to adjust course and settings after setup.

Why your boat's steering decides calibration

The steering system already aboard your boat decides which autopilot pack fits, and it also decides how calibration works. A tiller-steered sailboat uses a tiller pilot or a tiller drive. A wheel-steered boat uses a wheel pilot. A hydraulic steering system uses a hydraulic pump. Raymarine's pack list names these variants directly, such as the EV-100 Tiller, the EV-100 Wheel, and the power pilot packs for hydraulic steering.

A boat with an electronic helm, such as a drive-by-wire system, is a different case. The pack title names the helm or engine system, and the maker's page is the source for what the pack requires. Compare two listings by looking at the steering type named in the pack title and the drive in the box. That is the starting point for calibration, because the drive is the part that meets your steering. See the tiller pilot guide and the hydraulic autopilot guide for those choices.

The maker's manual and a qualified installer

The maker's manual covers installation, wiring, commissioning and calibration. This site gives no installation or calibration steps, because those belong to the manual and to a qualified installer. A dealer or a certified installer has the tools to match the system to your steering, mount the drive, run the network cables, and then set up the heading sensor and the rudder reference.

The NMEA 2000 standard, described on the NMEA page, is a CAN-based network that connects marine electronics so they share data and commands. An autopilot may connect to a chartplotter over such a network. The maker's manual and the dealer are the sources for what connects to what on your boat.

• Questions to ask an installer:
• Does the pack include the drive and control head my steering needs?
• What does the maker's manual say my boat's steering type requires?
• Which heading sensor or rudder reference does the system need?
• Will the dealer handle commissioning and calibration after installation?

What to prepare before and after

Before you buy, know your boat's steering type, whether the listing is a complete pack or a core pack, and whether a control head is in the box. A complete pack names the drive and the control head; a core pack leaves the drive out. If you are keeping an existing drive, the maker's page decides whether that drive works with the new pack. The complete autopilot packs guide and the autopilot core packs guide compare those listings on stated details.

After installation, keep the manual and the records of the settings. Note which alarms the system offers and ask the dealer about them. Software updates are a question for the maker's page, not for a news article. Your notes help the installer or a future owner understand what was done.

Calibration, the watch and responsibility

An autopilot, however well calibrated, does not replace a lookout. The U.S. Coast Guard's Boating Safety page exists to reduce loss of life, injuries and property damage on U.S. waterways by improving the knowledge, skill and abilities of recreational boaters. Keeping watch and knowing the navigation rules are the operator's job, with or without an autopilot.

This site makes no safety claims for any autopilot. The guides compare listed details, such as the drive in the box, the control head, and the model line, so you can match a pack to your steering and your budget. For questions about alarms, installation and calibration, ask the maker or a dealer. See the sailboat autopilots guide and the powerboat autopilots guide for the choices that match your boat.

What to pick for your situation

Questions

Is autopilot calibration something I can do myself?

Calibration is a setup procedure described in the maker's manual. This article and this site do not give calibration steps; the manual and a qualified installer are the right sources.

What does calibration actually cover?

It covers the heading sensor or compass, the rudder reference and the drive unit, so the autopilot matches the boat's steering. Some makers describe systems as self-calibrating or self-learning, which means the software adjusts itself after setup.

Do I need a rudder reference unit?

It depends on the system. Furuno states that its Fantum Feedback removes the need for a physical rudder feedback unit for outboard and sterndrive installations. For other systems, the pack listing and the maker's page decide.

Will calibration keep me safer on the water?

No autopilot replaces a lookout. The U.S. Coast Guard boating safety page is the reference for boating education and safe operation; keeping watch is the operator's responsibility.

What should I ask a dealer before buying a pack?

Ask whether the pack includes the drive and control head your steering needs, what the maker's manual covers, and whether the dealer handles installation and calibration.