What Are Different Steering Modes Of Autopilot
Introduction: Why “Steering Mode” Matters More Than Most Juniors Think
On my first deep-sea run, I thought autopilot was just a fancy “ON/OFF” switch—turn it on, the ship follows the heading, and that’s it. Then we hit a stretch of strong quartering seas, and our wake started looking like a zig-zag line on the ECDIS. The OOW changed the autopilot steering mode, adjusted a couple of values, and suddenly the ship settled down like it had found its balance again.
That’s when it clicked: autopilot steering modes are not just “features”—they’re tools. And like any tool onboard, using the wrong one at the wrong time can make life harder (or unsafe).
In this blog, I’ll break down the different steering modes of marine autopilot in simple language, with seafarer-friendly examples, so you can understand what they do, when to use them, and why they matter.
What Is an Autopilot Steering Mode (In Plain Words)?
A ship’s autopilot is part of the steering control system. Instead of the helmsman constantly correcting the wheel, the autopilot sends commands to the steering gear to keep the vessel on a desired “track” or “heading”—depending on the selected mode.
Steering mode simply means: what the autopilot is trying to follow.
- Heading: “Keep the ship pointing 090°.”
- Track: “Follow this planned route line on ECDIS.”
- Route/Waypoint: “Go from WP1 to WP2 to WP3.”
The exact names can vary by maker (Sperry, Anschütz, Tokimec, Navis, etc.), but the logic is broadly the same across vessels.
Who Uses These Modes (and When)?
Most of the time, the Officer of the Watch (OOW) selects the steering mode during sea passages. On some ships, the Master may set standing orders about when autopilot is allowed and in what mode.
When are steering modes selected?
- During open sea passage (autopilot commonly used)
- When changing from coastal navigation to ocean navigation
- When switching between “follow heading” and “follow track”
- When weather worsens and yaw control needs adjustment
Important reminder (practical and compliance-based): autopilot does not remove the responsibility of keeping a proper lookout. That’s straight in line with COLREG principles (lookout and safe navigation). For official reference, see the IMO’s COLREG framework on the IMO site: https://www.imo.org/
The Main Different Steering Modes of Autopilot (Explained Like You’re On Watch)
1) Heading Control Mode (AUTO / HDG / Compass Mode)
This is the most basic and most widely used mode. In Heading Mode, the autopilot keeps the ship on a selected compass heading.
What it does:
It compares the ship’s present heading (gyro/compass input) with the set heading, then applies rudder to correct the difference.
When it’s useful:
- Open sea with minimal traffic
- Simple courses where you just need to hold a heading
- When you don’t want ECDIS track control to alter course automatically
Seafarer tip:
If you’re in heading mode and there’s set and drift (current), you may still be “on heading” but not “on track.” On the ECDIS, you’ll see your track sliding off the intended line.
Think of it like holding the steering wheel of a car straight while driving on a road with side wind—you’re pointing straight, but you may still drift sideways.
2) Track Control Mode (TRACK / NAV / TRK)
This is a smarter mode. Instead of maintaining only a heading, the autopilot tries to keep the vessel on a planned track line (usually from ECDIS).
What it does:
- Uses cross-track error (XTE): how far you are from the planned track
- Applies a correction heading (often called “course to steer”)
- Compensates for current and wind, within limits
When it’s useful:
- Ocean passages with a defined route
- Areas where maintaining the track is more important than holding a heading
- Long legs where current can push you off your route
Real-life bridge example:
On a loaded tanker in ballast-to-load condition, we had a steady current setting us to port. In heading mode, we kept “beautiful heading,” but the track was slowly walking outside the corridor. Track mode fixed that by automatically applying a small correction angle.
Good seamanship note:
Track control can change heading to regain track. That’s why you must be careful in traffic, TSS, fishing grounds, or near hazards—monitor it like you’d monitor a helmsman.
For official navigation and equipment context, you can refer to IEC standards via the International Electrotechnical Commission: https://www.iec.ch/ (they publish key marine navigation performance standards used by manufacturers and regulators).
3) Waypoint / Route Mode (Waypoint Sequencing / Route Tracking)
Some systems separate “Track” from “Route.” In Route/Waypoint mode, the autopilot not only follows the track but also handles waypoint changes using the ECDIS passage plan.
What it does:
- Follows the active leg
- Initiates alteration at or near a waypoint (depending on settings)
- May use turn radius or turn rate data (if supported)
When it’s useful:
- Long routes with many legs
- Open sea where automatic leg changes reduce workload
Safety reality check (very important):
Automatic waypoint change is not a substitute for watchkeeping. Before letting the system alter course:
- Confirm the next leg is safe
- Check crossing traffic and CPA/TCPA
- Verify passage plan and no-go areas
If you’ve sailed with different Masters, you’ll notice some don’t allow route mode in confined waters at all—and honestly, that’s often wise.
4) Rudder (Manual Follow-Up / Non-Follow-Up) vs Autopilot Modes
This isn’t always called a “mode of autopilot,” but on practical ships, steering control is often described in these operational modes because they decide who controls the rudder.
Follow-Up (FU): You set a rudder angle, the system holds that angle.
Non-Follow-Up (NFU): Press-and-hold port/starboard; rudder moves while you press.
Where this matters:
- Emergency steering situations
- Changeover between autopilot and hand steering
- Loss of some control signals
This is the “hands-on” end of steering—more like direct driving compared to cruise control.
For rules and guidance connected to safe navigation and watchkeeping principles, the IMO is the best official starting point: https://www.imo.org/
5) Special Autopilot Behaviour Modes (Weather / Economy / Adaptive Settings)
Many modern autopilots offer extra behaviour options rather than entirely separate steering targets. Makers may call these:
- Weather / Heavy Weather mode
- Economy / Fuel-saving mode
- Adaptive / Rate-based control
What they generally try to do:
- Reduce unnecessary rudder movements (less wear, less drag)
- Control yaw more smoothly
- Improve course-keeping in sea conditions
Why it matters onboard:
Each rudder movement is drag. Drag is fuel. And in rough seas, aggressive rudder action can make the ship yaw more, not less. So these settings can help keep the ship steadier and more efficient—if tuned correctly.
That said, don’t treat “economy” as magic. If traffic is heavy or the ship is struggling to maintain a safe path, you may need tighter control (and sometimes even hand steering).
How to Choose the Right Steering Mode (Practical Checklist)
If you’re unsure on watch, ask yourself these simple questions:
- Do I need to follow a precise route line? Use Track/Route mode (if safe and permitted).
- Is traffic heavy or am I near hazards? Consider hand steering or at least avoid automatic course alterations.
- Am I being set off track by current? Track mode can compensate better than heading mode.
- Is the ship yawing badly in seas? Try the autopilot’s weather/adaptive behaviour settings—or switch to hand steering if needed.
- Do company/Master’s orders restrict autopilot use? Follow them—always.
Common Mistakes I’ve Seen (So You Don’t Repeat Them)
1) Using Track Mode in Busy Waters Without Close Monitoring
Track control may adjust heading to regain track, and that can create awkward situations with nearby traffic if you’re not alert.
2) Trusting Waypoint Auto-Change Like It’s an AB on the Wheel
Route mode is helpful, but it can’t “understand” developing traffic patterns the way a good helmsman and a focused OOW can.
3) Not Understanding What the Autopilot Is Actually Following
If you think you’re in heading mode but you’re in track mode (or vice versa), you can get surprises during course changes or set/drift conditions.
Quick Takeaway: The Big Difference Between Heading and Track
Heading Mode says: “Keep pointing this direction.”
Track Mode says: “Stay on this route line, even if I must point a little off to fight current.”
If you remember that one line, you’ll already be ahead of many first-time OOWs.
Conclusion: Autopilot Is a Tool—You’re Still the Navigator
The different autopilot steering modes—heading control, track control, route/waypoint sequencing, and the supporting manual steering options—exist because the sea never stays the same. Current, wind, traffic, and visibility change the game every watch.
Use the mode that matches the situation, keep monitoring like you would with a helmsman, and always follow company procedures and the Master’s standing orders. That’s how autopilot becomes a help—not a hidden risk.
Tags: autopilot steering modes, heading control mode autopilot, track control mode ship autopilot, marine autopilot heading vs track, waypoint route mode autopilot, ship steering gear control modes, OOW autopilot best practices, heavy weather autopilot settings, ECDIS track control navigation, merchant navy bridge watchkeeping
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