Sailing's Right-of-Way Rules: Four Rules That Decide Every Collision

The four rules, in order

Rule	Situation	Who must keep clear
10	Opposite tacks	the port-tack boat
11	Same tack, overlapped	the windward boat
12	Same tack, not overlapped	the boat clear astern
13	While tacking	the tacking boat

How those rules are policed at a hundred kilometres an hour is covered in SailGP’s rules.

Every right-of-way question in sailing resolves to one of these four, and they are applied in order: first establish whether the boats are on the same tack, then whether they overlap.

Rule 13 switches the others off

This is the provision that makes sailing’s rules more interesting than a simple hierarchy.

After a boat passes head to wind, she shall keep clear of other boats until she is on a close-hauled course. During that time rules 10, 11 and 12 do not apply.

A tacking boat does not merely lose priority. The rest of the framework is suspended. For the duration of the manoeuvre there is no port/starboard, no windward/leeward, no ahead/astern — there is only one obligation, and it belongs to the boat that is turning.

The reason is that during a tack a boat is temporarily neither one thing nor the other. She has passed head to wind but is not yet sailing on the new tack, so the categories the other rules depend on do not describe her. Rather than force an answer out of a definition that does not fit, the rulebook suspends the definitions.

And when two boats are tacking simultaneously, a tiebreak applies: the one on the other’s port side keeps clear.

The rules describe obligations, not permissions

Squash makes the same choice under far more pressure, imposing a duty to make every effort to clear rather than a rule against blocking — see squash’s let and stroke rules.

Read the right-hand column again. Every rule names who must keep clear — not who may hold their course.

That is a deliberate framing. A boat with right of way is not entitled to cause a collision; she has obligations of her own elsewhere in the rulebook. What rule 10 establishes is that if there is contact, the port-tack boat has failed, whatever the other boat did.

Assigning the duty rather than the privilege makes the rules decidable after the fact. A jury looking at a collision does not need to determine who was faster or who had the better line. It needs to determine which category each boat was in, and the answer follows.

That is the same drafting instinct as field hockey defining obstruction by effect rather than method: write the rule so that applying it is a question of fact.

The competitors run the enforcement

The Olympic formats layered on top of those rules are stranger still — see Olympic sailing formats, where a dominant series lead can fail to carry into the medal series at all.

Sailing is unusual, and in most formats there is no official watching your incident.

A race can involve dozens of boats across a course kilometres wide. There is no possibility of officiating every interaction the way a referee officiates a pitch. So the sport does something few others do: it makes competitors responsible for initiating the process.

A boat that believes another has broken a rule protests, and a jury hears the case after racing. In many formats a boat that knows she has infringed can instead take penalty turns on the water — accepting a time cost immediately rather than facing a hearing.

That self-policing element is why the sport’s culture treats rule knowledge as a competitive skill rather than an administrative chore. Some formats do use on-water umpires, but the protest system remains the backbone.

Compare who else trusts the athletes

Most sports assume enforcement must be external. Anti-doping runs on strict liability precisely because it will not rely on athletes’ accounts. Football’s VAR forbids players from even lobbying about a review.

Sailing takes the opposite view, out of necessity rather than idealism: the course is too big to police, so the rules are written to be applied by the people sailing them, and the penalty for being wrong is a hearing rather than an instant sanction.

More rulebook coverage is in rules and techniques.