Piloting is navigation in sight of land, using visible marks – headlands, lighthouses, buoys, church spires, chimneys – together with the depth sounder and the chart to fix and steer the boat. British sailors usually say “pilotage” for the same skill, and both words come from the pilot who boards a ship to guide her into a harbour he knows better than her master does. Beginners think of piloting as the easy part of navigation because you can see where you are going. Experienced skippers know it is the part where boats are actually lost, because the rocks are close and a small mistake puts you aground.
The tools of piloting
Piloting is done with your eyes first and instruments second. The essential kit is small: a chart (paper or electronic) of large enough scale to show the detail, a hand-bearing compass, a depth sounder, a pair of binoculars, and a watch. Add a pilot book or almanac for lights, buoyage and tidal streams and you have everything the professional pilot has, apart from local knowledge.
From those tools you build a picture of where you are:
- Fix by bearings: take compass bearings of two, preferably three, charted objects spread around the horizon and plot them. Where the lines cross is your fix. Three lines that make a small “cocked hat” tell you the fix is good; a big triangle tells you something is wrong.
- Transit (range): two charted objects in line give a position line with no compass error at all. Transits are the most accurate tool you have, and a good pilot is always looking for them.
- Depth contour: following a charted depth line with the sounder, corrected for the height of tide, is a position line in its own right.
- Clearing bearing: a bearing on a fixed object that, as long as it stays greater or less than a chosen value, keeps you clear of a danger you cannot see. It lets you sail hard without plotting every minute.
Piloting versus dead reckoning and GPS
Dead reckoning (DR) is where you think you are from course and distance run since your last known position; piloting is checking that against the real world. The two are partners. A pilot keeps a DR going even in clear weather, because the visibility can shut down in five minutes.
GPS has not made piloting obsolete, it has changed what it is for. The chart plotter gives you a position; piloting tells you whether to believe it and what to do about it. Buoys get moved, sandbanks migrate, chart datums differ, and a plotter zoomed out too far hides the drying rock that a hand bearing would have warned you about. The habit that keeps boats off the putty is simple: every time the plotter says you are somewhere, look up and find two things that confirm it.
Making a pilotage plan
The difference between a skipper who is relaxed entering a strange harbour and one who is shouting is almost always preparation. Before you arrive, sit at the chart table and write a plan on a single page or a laminated card in the cockpit:
- The waypoint or landmark that marks the start of the approach and the safe bearing to it.
- Each leg in turn: course to steer, distance, what you should see ahead and abeam, and the depth you expect.
- The dangers on each leg and the clearing bearing or transit that keeps you off them.
- Tidal height at your arrival time and the stream direction in the entrance.
- An escape: where you go if the entrance is blocked, the visibility drops or the engine stops.
Racing and cruising perspectives
Cruisers pilot to arrive safely; racers pilot to arrive first, and they use the same tools in a sharper way. A racing navigator uses transits on the shore to judge the line at a start, watches the depth sounder to find the edge of a tidal eddy, and knows to the boat length where the shoal begins because that is where the favourable current turns. Piloting a tidal gate, timing a passage through a narrow channel so the stream turns in your favour as you arrive, is often the decisive move of a coastal race.
Frequently Asked Questions about Piloting
Is piloting the same as pilotage?
Yes. Piloting is the usual North American term and pilotage the usual British one; both describe navigating in coastal and harbour waters by visible marks and soundings.
How often should I fix my position when piloting?
Often enough that a mistake cannot hurt you before the next fix. In open coastal water every 15 to 30 minutes may do; in a narrow channel you are fixing continuously by transits and buoys.
Do I still need to learn piloting if I have a chart plotter?
Yes. The plotter tells you where it thinks you are; piloting confirms it against the real world and gives you a way home when the screen goes dark, the antenna fails or the chart is wrong.
Piloting is navigation as a craft rather than a calculation. It rewards looking up, knowing your marks and thinking ahead, and it is the part of seamanship that keeps a crew safe at exactly the moment the sailing gets most interesting. Learn it well, keep doing it by hand even when the electronics work, and every harbour entrance becomes a satisfying problem rather than a worry.