Five, Four, One, Go: A Complete Guide to the RRS 26 Starting Sequence
Somewhere in your fleet tonight there is a sailor who starts their watch on the horn. Rule 26 says, in one sentence, that they are timing off the wrong thing: times are taken from the visual signals, and the absence of a sound signal is to be disregarded. The gun is a courtesy. The flag is the race. Almost everything else that goes wrong on a start line follows from not knowing that.
Rule 26 is about half a page long. It is also the rule that a first-time race officer is most afraid of, the rule that produces the most confident wrong answers at the bar, and the one place in club racing where a small procedural slip quietly decides who wins.
Here is the whole thing: the sequence, what each signal is actually doing, the five flags you can fly at four minutes and what each one costs a boat, the two kinds of recall, and what to do when you — not the fleet — are the one who got it wrong.
The whole sequence, in one table
This is rule 26 of the 2025–2028 Racing Rules of Sailing, essentially in full:
| Minutes before start | Visual signal | Sound | Means |
|---|---|---|---|
| 5* | Class flag displayed | One | Warning signal |
| 4 | P, I, Z, Z with I, U or black flag displayed | One | Preparatory signal |
| 1 | Preparatory flag removed | One long | One minute |
| 0 | Class flag removed | One | Starting signal |
Four signals, three of which are a flag going up or coming down. Note what is not in that table: no ten-minute signal, no five-minute gun before the warning, no countdown over the VHF. Those are all things clubs add, and adding them is fine — but they are not the rule, and a boat that times off one of them and gets it wrong has no case.
The flag governs, the horn is a courtesy
The single most important sentence in rule 26 is the one before the table: times are taken from the visual signals, and the absence of a sound signal is to be disregarded. Your gun can misfire, your air horn can run out halfway through the season, your committee can forget entirely — and the start still stands, because the flag came down when it came down.
There is a practical reason for this that has nothing to do with legalism. Sound travels about a third of a kilometre a second. On a start line 400 metres long, the boat at the pin hears your horn more than a second after the boat at your transom does. In fifteen knots of breeze with a fleet of dinghies planing past, they may not hear it at all. The flag is visible to everyone simultaneously; the horn is not.
Rule 25.3 makes the flag requirement more forgiving than most people assume: when the race committee is required to display a flag, it may use a flag or other object of similar appearance. A rolled fender on a boathook is a legal class flag if it looks the part and your sailors know what it is. What is not legal is timing your hoist off your own horn.
Hoist on the count, not on the bang: the person on the halyard works to the timekeeper's "3, 2, 1, now" — and the gunner fires to the flag, not the other way round. Flags on staffs or poles go up more crisply than flags on a halyard, which is why serious committees use them. If you are on a halyard, furl the flag and break it out at the signal.
Every phone in the fleet counts down to the same instant. Each device works off a server clock offset rather than its own, so the countdown on the boat at the pin and the countdown on the committee boat agree — and the horns fire together rather than rippling down the line. The horns are still a convenience: if you are running a line with real flags, the flag is what governs, and the app is there so nobody is guessing at the time remaining.
What the class flag is actually doing
The warning signal has one job: to say which boats are starting in five minutes. In a single-fleet Wednesday-night race that sounds like ceremony, and half the clubs in the country fly a club burgee and call it done. That is perfectly legal — as long as the sailing instructions say what the class flag is. The moment you have two starts, it stops being ceremony.
Rule 26 handles multiple classes with one line: the warning signal for each succeeding class is made with or after the starting signal of the class before it. In practice that produces the rolling sequence every regatta uses, where one class's start is simultaneously the next class's warning:
| Clock | Class A | Class B | Sound |
|---|---|---|---|
| −5:00 | Warning — class flag A up | One | |
| −4:00 | Preparatory — P up | One | |
| −1:00 | P down | One long | |
| 0:00 | Start — flag A down | Warning — flag B up | Two |
| +1:00 | Preparatory — P up | One | |
| +4:00 | P down | One long | |
| +5:00 | Start — flag B down | One |
That row at 0:00 is where short-handed committees come unstuck. One person has to drop flag A and raise flag B on the same count while somebody else makes two sounds and a third person is trying to read sail numbers on the line. If you have three people on the boat, do not run a rolling start. Run independent sequences instead — start class A, wait five minutes, then begin a fresh five-minute sequence for class B.
World Sailing's Race Management Manual notes that independent sequences per class are increasingly common even at major events, precisely because they buy separation between fleets and let the committee adjust the line between starts. What you lose is time. What you gain is a start you can actually run.
The two things that must happen before four minutes
Rule 27 quietly imposes two deadlines that catch people out.
The course goes up by the warning signal. Under rule 27.1, no later than the warning signal the race committee must signal or otherwise designate the course to be sailed, if the sailing instructions haven't already stated it. The same deadline applies to signalling that personal flotation devices are required (flag Y, one sound). If your course board is still being scribbled at four minutes, you are late.
The line freezes at the preparatory signal. Rule 27.2 allows the committee to move a starting mark no later than the preparatory signal. After the prep flag goes up, the line is what it is. So the window for squaring the line — watching how the fleet reacts, adjusting the pin — is the minute between the warning and the preparatory signal, and not one second later.
The Race Management Manual's guidance here has changed over the years and is worth knowing: it was once customary to lay the line with about five degrees of port-end bias to spread the fleet out. Current advice is to set a square line, at ninety degrees to the established average wind, and fine-tune by watching which end the fleet favours. Either way, it must be fixed by the preparatory signal.
One more deadline, this one on the sailors: rule 45 requires a boat to be afloat and off moorings at her preparatory signal. That is the rule that stops a boat sitting on a mooring until 30 seconds to go.
The preparatory flag is where the real decisions live
Here is the part most club sailors have never had explained properly. At four minutes you are choosing among six options, and the choice changes what a boat's mistake costs her. All of the rule 30 penalties bite in the last minute before the starting signal — never earlier.
| Flag | Rule | What is forbidden in the last minute | Penalty | Survives a restart or resail? |
|---|---|---|---|---|
| P blue, white centre | — | Nothing extra | Over early: return and start properly | n/a |
| I yellow, black circle | 30.1 | Hull on the course side of the line or its extensions | Must sail around an end to get back | n/a |
| Z four triangles | 30.2 | Hull inside the triangle formed by the line ends and the first mark | 20% scoring penalty, no hearing | Yes — and again if repeated |
| U red/white checks | 30.3 | Same triangle | Disqualified, no hearing | No |
| Black | 30.4 | Same triangle | Disqualified, no hearing | Yes — and barred from the restart |
The distinction almost nobody gets right is U versus black, and it is entirely contained in that last column. Both disqualify a boat without a hearing for being in the triangle in the final minute. Under U, the disqualification evaporates if the race is restarted or resailed. Under the black flag, it does not — and rule 30.4 goes further: the committee must display her sail number before the next warning signal, she must not sail the restart, and if she does anyway, that disqualification cannot be dropped from her series score.
That is the difference between a bad evening and a ruined series. The U flag is the black flag with the cruelty taken out, and it is the right escalation for almost every club fleet.
The Z flag is the one worth pricing out, because "20%" is abstract until you do the arithmetic. Under rule 44.3(c) the penalty is 20% of the score for Did Not Finish, rounded to the nearest tenth of a point. Under rule A5.2, Did Not Finish scores one more than the number of boats entered in the series. So in a twenty-boat series, DNF is 21 points and the penalty is 4.2 points — added to whatever she would otherwise have scored. A boat that crosses third and gets nicked by the Z flag scores 7.2. And unlike a disqualification, it stays with her through a restart, and a second offence adds another 4.2.
Climb the ladder, don't start at the top: fly P. If you get a general recall, go to I. If you get another, go to U. Reserve the black flag for a fleet that has already proved it will not be governed — which, in club racing, is almost never. A black flag on the first start of a Wednesday-night series tells your fleet you expect the worst of them, and the boats it catches are usually the ones who most needed the evening to go well.
The rule 30 flag is set when you create the race — P, I, Z, U or black — and it travels with the race to every competitor. On the countdown screen the preparatory card shows the actual flag in force rather than a generic icon, so nobody is squinting at the committee boat wondering what the yellow one means. When the committee later calls a boat OCS, the alert that lands on that sailor's phone renders the same flag and the remedy that goes with it.
The one-minute signal, and why it sounds different
At one minute the preparatory flag comes down, accompanied by the only long sound in the sequence. Two things are worth noticing about that.
First, the removal is the signal. A flag coming down is a legitimate visual signal, exactly like a flag going up. A surprisingly common club error is to lower the prep flag somewhere "around a minute" and then, realising the timing was off, hoist it again. Don't. You have just given the fleet two contradictory one-minute signals, and any boat that timed off the first has a genuine grievance.
Second, the long sound exists because this is the signal a distracted crew is most likely to have missed the visual for. It is deliberately unmistakable. Make it long — around three seconds — and make it obviously different from your other sounds.
This is also the moment the rule 30 restrictions switch on. Everything in the table above applies "during the last minute before her starting signal", so the triangle becomes live exactly when the prep flag comes down.
What "started" actually means
The definition matters more than people think, because it is not "crossed the line at the gun". A boat starts when, her hull having been entirely on the pre-start side of the line at or after her starting signal — and having complied with rule 30.1 if the I flag is up — any part of her hull crosses the line from the pre-start side to the course side.
Read the phrase "at or after her starting signal" carefully, because it is the whole mechanism. A boat that is over early has not started. She starts only once she has got her whole hull back behind the line at some point after the gun and then crossed again. Her elapsed time still runs from the starting signal, so the return is expensive — but it is a return, not a disqualification, and under flag P she may re-cross anywhere on the line.
Under flag I, that changes: she must sail across an extension of the line so that her hull is completely on the pre-start side. That is the "round-the-ends" rule, and it is expensive enough that it deters a whole fleet from creeping.
When it goes wrong: the two recalls
Individual recall (rule 29.1). When at the starting signal any part of a boat's hull is on the course side, or she must comply with rule 30.1, the committee promptly displays flag X with one sound. Flag X stays up until every such boat's hull has been completely on the pre-start side of the line or one of its extensions, and has complied with rule 30.1 where that applies — but no later than four minutes after the starting signal, or one minute before any later starting signal, whichever comes first.
Two things clubs routinely get wrong here. First, X is a flag, not a hail. Calling sail numbers over the VHF is a kindness many clubs offer and it is not required, not authoritative, and not what makes the recall valid — a boat that never hears her number is still OCS. Second, that four-minute cap is a hard ceiling, and it exists so a boat can't be left wondering indefinitely.
Rule 29.1 also has a quiet exclusion: if rule 29.2, 30.3 or 30.4 applies, rule 29.1 does not. Boats caught by the U flag or the black flag are not individually recalled. They are simply out.
General recall (rule 29.2). When at the starting signal the committee cannot identify the boats that are over, or to which rule 30 applies — or there has been an error in the starting procedure — it may signal a general recall by displaying the First Substitute with two sounds. The warning signal for the new start is made one minute after the First Substitute is removed, with one sound, and the starts for any succeeding classes follow the new start.
That middle clause — an error in the starting procedure — is the escape hatch for your own mistakes, and it is the most under-used sentence in the whole of Part 3.
The mistakes that actually happen
Not one of the common failures is a sailor problem. They are all committee problems, and they all have the same fix.
The mistimed signal. You hoist the prep flag a minute late. The rules are unforgiving about what this means: the absence of a sound signal is disregarded, but a mistimed signal is a race committee error that no rule excuses. The Race Management Manual is explicit that where the mistiming could mislead boats — into being scored OCS, or into requesting redress for a late start — the prudent course is to postpone if there is time, or abandon and restart.
This is not theoretical. A well-known discussion on the RacingRulesOfSailing forum works through exactly this case: warning at 13:40, preparatory a minute late at 13:42, boats starting at 13:45 and then scored OCS. The judges' consensus was instructive in both directions. Boats may legitimately time from any signal in the sequence — the rule gives no hierarchy — so a late prep splits the fleet into two different beliefs about when the gun is. But most judges also held that the boats had two later signals to correct against, so redress was not automatic. The committee owned the error and the sailors ate it. That is the outcome to avoid.
The distracted timekeeper. World Sailing's manual is blunt about this: after the race officer, the timekeeper is the most important person on the boat, and more starts have been spoiled by the timekeeper being distracted by unnecessary chatter than by any other single cause. The recommended call is mechanical and out loud — "one minute to the warning signal; thirty seconds; fifteen; ten; nine, eight, seven… now" — so that everyone on board is working to the same number.
Pushing on through a fumble. The instinct when a sequence goes wrong is to carry on and sort it out later. It is always the wrong instinct. A general recall costs you six minutes. A start that half the fleet timed differently costs you the race, and possibly the protest evening.
Radio silence from five minutes: no VHF traffic, no discussion of the course, no asking who that boat is, until the gun has gone. If the pin-end boat needs to report, it reports in the gap between the start and the next warning. The manual's advice is also to keep the volume down — the committee's chat about who looks over is not for the fleet.
Postponing and abandoning before the gun
Rule 27.3 lets the committee, before the starting signal and for any reason, postpone or abandon:
- Postpone: display AP, AP over H, or AP over A, with two sounds. Plain AP means the warning signal will be made one minute after AP is removed. AP over H sends the fleet ashore for further signals; AP over A means no more racing today.
- Abandon: display N over H or N over A, with three sounds.
The one-minute-after-removal rule is the same interval as a general recall, and it is a good deal shorter than most crews expect. If you postpone, be ready: the fleet gets sixty seconds of notice before you are back at the warning signal.
The Race Management Manual adds a useful convention for the orange starting-line flag: display it five minutes before the warning signal so boats know a sequence is imminent, and remove it during a long delay so nobody is staring at a line that isn't going to be used for half an hour. That is a sailing-instruction matter rather than a rule, but it is a cheap courtesy.
Changing the sequence — legally
Look again at the asterisk on the five in the rule 26 table: or as stated in the notice of race or sailing instructions. The five-minute warning is a default, not a commandment. Under rule 86.1(b), the notice of race or sailing instructions may change a racing rule (with a short list of exceptions that does not include rule 26), so a 3–2–1–go sequence is entirely legal if you publish it. Team racing uses it as standard; frostbite fleets, foiling classes and short-course dinghy racing often do too.
Two things to keep straight if you shorten it. The shape of the sequence doesn't change — the preparatory signal is still one minute after the warning, the one-minute signal is still at one minute, and the rule 30 window is still the final minute. And whatever you choose, publish it. Appendix J requires the notice of race to state the times of the warning signals for the first race and, where known, the succeeding races.
The honest counter-argument is consistency. World Sailing explicitly encourages committees to adopt the standard system so that sailors travelling between regattas meet the same sequence everywhere. If your fleet has no particular reason to be different, the five-minute sequence is the right answer for the same reason a standard start line is: nobody has to think about it.
Pick the sequence when you create the race — ten, five or three minutes. Ten suits offshore and heavy cruising classes; five is the rule 26 standard; three suits foiling boats and frostbite fleets. Whichever you choose, every device runs the same shape: warning, preparatory, one minute, gun — with the horns scheduled on each phone off the same synchronised clock.
What to do when you have three people and no gun
Most club racing is not run by a six-person committee with a cannon. It is run by whoever didn't get a boat that night. The sequence still works; you just have to strip it to what the rule actually requires.
- One person on the clock, and nothing else. Calling the count is a full job. Give it to the person least likely to be asked a question.
- Flags on staffs, not halyards. Two short poles in rod holders will run a whole sequence more crisply than a mast and a tangle of line.
- One flag for the prep. You need P and, if you ever escalate, one of I or U. That is a two-flag kit plus your class flag, X and the First Substitute.
- Sound is optional, so don't panic about it. A single air horn is fine. A voice is fine. Nothing is legally fine.
- If you cannot see the line, don't fly a penalty flag. Rule 30 penalties require you to identify the boat. A black flag you can't enforce is worse than a P flag you can.
If a sequence goes wrong before the gun, the committee can recall it from the countdown screen — the fleet drops back to the lobby, the clock resets, and any track logged during the aborted countdown is discarded so it doesn't get spliced into the race replay. Once the fleet is away, boats over early get an OCS call from the leaderboard that pushes a full-screen alert to that sailor's phone, showing the flag in force and what they have to do about it. Committee duties can also be shared: added committee members run the same actions from their own phones, which is how a three-person committee stops being a one-person committee.
The whole thing on one card
If you take nothing else onto the boat, take this:
- −6 — line square, course board ready, everyone knows their job.
- −5 — class flag up, one sound. Course must be designated by now.
- −5 to −4 — last chance to move a starting mark.
- −4 — preparatory flag up, one sound. Default is P.
- −1 — preparatory flag down, one long sound. Rule 30 is now live.
- 0 — class flag down, one sound. Watch the line, not the flag.
- Boats over, and you know who — flag X up, one sound, promptly. Down within four minutes.
- Boats over, and you don't — First Substitute, two sounds. New warning one minute after it comes down.
- You got the timing wrong — general recall or postpone. Never push on.
Everything else in this article is explanation. That list is the job.
Run the sequence without watching the clock
Committee Boat HQ counts every boat down to the same gun off a synchronised clock, sounds the warning, preparatory, one-minute and start horns on every phone, and shows the rule 30 flag you chose for the race. Five, four, one, go — without one person on the boat doing nothing but staring at a watch.
Sources
- The Racing Rules of Sailing 2025–2028, Part 3, Conduct of a Race (rule 25.3, flags and objects of similar appearance; rule 26 and its signal table; rule 27.1–27.3, course designation, moving a starting mark, postponement and abandonment; rule 29.1 and 29.2, individual and general recalls; rule 30.1–30.4, the I, Z, U and black flag rules).
- The Racing Rules of Sailing 2025–2028, World Sailing (the definition of Start; the Race Signals section, including AP, N, X and the First Substitute; rule 44.3(c), the 20% Scoring Penalty; rule 45, afloat and off moorings at the preparatory signal; rule A5.2, the score for Did Not Finish).
- The Racing Rules of Sailing 2025–2028, Part 7, Race Organization (rule 86.1(b), changes to the racing rules by the notice of race or sailing instructions).
- The Racing Rules of Sailing 2025–2028, Appendix J (J1.1(6), publishing the times of warning signals in the notice of race).
- Race Management Manual (PDF), World Sailing (the 5-4-1-0 system and alternative intervals; independent sequences per class; the orange starting-line flag convention; the square-line guidance replacing the old five-degree port bias; the timekeeper's countdown and the warning about distraction; mistimed sound signals as an unexcused race committee error). See also the current edition.
- "Error in timing between warning and prep signal", RacingRulesOfSailing forum (the late-preparatory-signal case; boats may time from any signal in the sequence; redress and the committee's corrective powers under rules 29.2 and 32).
- The Racing Rules of Sailing 2025–2028, US Sailing (the current rulebook, national prescriptions and the summary of changes from the previous edition).