Safety and rules · 6 minute read
Autopilot watchkeeping routines
How an autopilot changes the watch but not the responsibility: watch systems, scanning routines, alarms, fatigue, handovers and Australian coastal hazards.
An autopilot does not reduce the number of people you need on watch. It changes what they do. Instead of standing at the wheel steering a compass course for four hours, the person on watch is monitoring: looking for traffic, checking the sails, watching the weather, reading the instruments and thinking about the next few hours.
That is a better use of a human being, and it is also harder to do well. Steering keeps you awake and gives you something to do. Monitoring does not. The boats that run good watches with a pilot engaged are the ones that make the watch an active job with a routine, not a seat in the cockpit.
Key facts
- The rule
- COLREGs Rule 5 requires a proper lookout at all times
- Scan cycle
- A full horizon and instrument scan every ten to fifteen minutes
- Two crew
- Commonly three or four hours on, three or four off
- Worst hour
- Around 3 am, when alertness bottoms out
- Alarms
- Off-course, cross-track, AIS CPA, depth and wind shift
- Handover
- A short spoken briefing, every single time
Watchkeeper duties while using an autopilot
The collision regulations that apply in Australian waters require a proper lookout by sight and hearing and by all available means, at all times. There is no clause that makes an autopilot a substitute. A boat under pilot with nobody looking out is a boat with no lookout, regardless of how good the electronics are.
What the pilot buys is attention. A helmsman concentrating on holding 045 degrees in a lumpy sea is not scanning the horizon properly, and after two hours is not thinking clearly either. Hand the steering to the machine and the same person can watch, plot, check the rig and stay ahead of the weather.
That only works if the watchkeeper knows what to do with the freedom. On a boat where the routine is clear, the pilot makes the watch better. On a boat where it is not, the pilot makes it easier to doze.
Watch systems for two, three and four
With two crew, the common patterns are three or four hours on and the same off through the night, with longer or more relaxed watches by day. Shorter night watches, two or three hours, keep people sharper at the cost of more broken sleep. Most cruising couples settle on something that gives the off-watch person one uninterrupted block of four hours or more.
With three crew, four hours on and eight off is generous and produces well-rested people, which is why deliveries often run it. With four, a two-watch system of two people each works well and means nobody is ever alone on deck at night.
Whatever the system, keep it consistent. The body adapts to a repeated pattern within a couple of days, and the crew that changes the roster every night stays tired the entire passage. Build in a dogwatch arrangement if you want to rotate which person gets the hard hours.
A scanning routine that keeps people awake
Give the watch a job list and a rhythm. Maintain a continuous, active lookout appropriate to the circumstances, using sight, hearing and the available navigation aids. Do not treat a fixed scan interval as permission to stop watching between scans. Standing up to do it matters as much as the content, because sitting still in the dark is what puts people to sleep.
The same routine also produces the information for the log. A watchkeeper who writes a position, a heading and a note every hour is a watchkeeper who is engaged, and the log is what lets the next person pick up the picture instantly.
- Stand up and sweep the full horizon, including astern, by eye
- Check AIS for targets and closest point of approach
- Check radar if fitted, including a guard zone if you use one
- Check heading, speed, cross-track error and battery voltage
- Look at the sails, the sheets and the chafe points
- Check the bilge and glance at the engine space
- Write the log entry: position, course, speed, wind, anything seen
Alarms are part of the watch, not a replacement for it
Set the alarms deliberately at the start of the passage rather than leaving them at factory defaults. An off-course alarm tight enough to catch a wind shift or a drive failure. A cross-track alarm sized to the sea room you actually have. An AIS closest point of approach alarm with a range and time that give you room to act. A depth alarm with real meaning under the keel, and a wind shift alarm if you are sailing a wind angle overnight.
Make sure everyone can hear them from the cockpit and from a bunk, and that everyone knows which sound means what. An alarm nobody recognises gets silenced, and an alarm that is silenced out of habit is worse than no alarm at all.
Alarms are a safety net for the things a human might miss between scans. They are not a licence to stop scanning. Fishing boats, yachts without AIS, containers, whales and unlit moorings do not set off any alarm at all.
The 3 am problem is real
Handovers and teaching new crew
Every watch change should include a spoken handover: where we are, what the weather is doing, what traffic is about, what mode the pilot is in and why, what is set on the alarms, what sails are up, what to expect in the next few hours, and when to wake the skipper. Ninety seconds, every time, and it prevents most of the confusion that turns a small problem into a big one.
New crew need explicit teaching on the pilot, not just a pointed finger. Show them how to disengage it and hand steer, what the alarms sound like, which mode it is in, and the specific circumstances in which they should take the helm without asking anyone. That last point matters most: a new crew member who is unsure whether they are allowed to disengage the pilot will hesitate at the wrong moment.
This is exactly what a good instructor covers in a shorthanded passage-making course, and it is worth asking the installer to include in a handover session as well. The equipment is the easy part. The habits are the training.
Australian coastal specifics
Fishing fleets are the traffic most likely to surprise you. Many smaller vessels carry no AIS, they work at night, they change course unpredictably while shooting or hauling gear, and their lights can be confusing against a shore background. Assume that a cluster of unexplained lights is a fishing boat and give it room.
Shipping off the New South Wales coast runs close inshore in places, and inside the Great Barrier Reef the shipping is funnelled into a defined route that crosses many cruising tracks. Both deserve a plan rather than an improvisation at two in the morning: cross at right angles, well ahead or well astern, and use AIS to confirm what you are seeing.
Whales are a genuine hazard on the east and west coast migration routes through winter and spring, and no electronic system detects them. Keep a visual lookout, slow down at night in known migration areas, and remember that the pilot will steer straight into one without a flicker.
Questions
Frequently asked
Can I use an autopilot instead of a watchkeeper?
No. The collision regulations require a proper lookout at all times, and an autopilot cannot see anything. It frees the watchkeeper from steering so they can look out properly, which is a real safety gain, but the person still has to be there and awake.
What watch system works best for a cruising couple?
Most settle on three or four hour night watches with more relaxed day arrangements, which gives the off-watch person at least one solid sleep block. Shorter watches keep people sharper but fragment sleep. Choose one and keep it consistent for the whole passage, because the body adapts to a repeated pattern.
What alarms should be set on passage?
At minimum an off-course alarm, a cross-track alarm sized to your sea room, an AIS closest point of approach alarm, and a depth alarm with genuine margin under the keel. Add a wind shift alarm when sailing a wind angle overnight. Check everyone can hear each one from a bunk and knows what it means.
How do I teach new crew to stand a watch with the pilot on?
Show them physically how to disengage it and hand steer, let them hear each alarm, explain which mode the pilot is in and why, and tell them explicitly when they are expected to take the helm without asking. Then stand a watch alongside them before they stand one alone. Written notes in the cockpit help at three in the morning.
What is the biggest collision risk on the Australian coast?
Fishing vessels without AIS, working at night and changing course unpredictably, are the traffic that most often surprises cruising crews. Shipping off New South Wales and inside the Great Barrier Reef is more predictable but faster than it looks. Whales on the migration routes are a hazard no electronics will detect for you.
Practise autopilot operation with an instructor
Habits are learned at the helm with someone watching. The training section explains what a good instructor covers and where to find one in your state.