SailGP Is Umpired From London: Seven Seconds to Rule on a 100km/h Collision

The umpires are not at the venue

SailGP’s officials work from Ealing, in west London, whatever ocean the racing is on.

That sounds like a cost-saving measure. It is the opposite: it is the only arrangement that makes the officiating fast enough.

An F50 catamaran flies on foils at over 100km/h. Two of them converging close a gap faster than a human on a chase boat can read the geometry, and a chase boat is in the wrong place for most of it anyway — behind, low to the water, with no view of the lines the boats were actually holding.

The umpires instead see live position, speed and heading data from every boat, on a screen, from above. Which is not a compromised view of the incident. It is a better one.

Seven to ten seconds

The chief umpire’s stated aim is a decision within seven to ten seconds of an incident.

That target is doing more work than any single rule.

A fleet race is continuous. There is no restart, no stoppage, no dead ball. A penalty decided two minutes later is applied to a race that has already moved on — the boats have rounded a mark, the positions have changed, and the remedy no longer fits the offence.

So SailGP is not optimising for certainty. It is optimising for immediacy, and accepting that a seven-second decision will occasionally be wrong.

Compare short track speed skating, which makes the opposite trade: it stops, reviews on video, and announces afterwards, because a heat has a finish line and a race around buoys does not.

The penalty is positional, and that is why it works

Most penalties require the offending boat to drop behind the boat it fouled, or lose 20 metres.

There is no points deduction for a routine foul, no time added at the end, no stop-go.

A positional penalty has a property that arithmetic penalties lack: it restores the situation. If you gained a place by fouling, giving the place back leaves both boats where they should have been, on the water, immediately. Nobody has to compute anything afterwards, and the spectator can see justice being done in real time.

It is the same reasoning as curling replacing the stones rather than awarding anything — the cleanest remedy is usually the one that undoes the act.

Both boats can be penalised

The clause that separates SailGP from most sports: penalty points can go to the guilty boat and also to the affected boat, if the umpires judge it did not do enough to avoid the collision.

Almost nowhere else in sport is the victim of a foul held partly responsible for being fouled.

But sailing has always worked this way, and it is not victim-blaming — it is collision avoidance. The right-of-way rules in sailing exist to prevent boats hitting each other, and a boat that holds its course knowing contact is inevitable, in order to win the protest, has used the rules to cause a crash.

At 100km/h on carbon foils, that is not a technicality. A collision can end a season and injure people. Penalising the boat that could have avoided it removes the incentive to be right at any cost.

The black flag

Umpires can issue an immediate black flag disqualification where a team puts another at high risk of serious collision or capsize.

Note what triggers it: risk, not damage. A manoeuvre that could have caused a catastrophe is punishable whether or not it did.

That is the correct threshold for a sport at these speeds, and it is rarer than it should be elsewhere. Most sports punish outcomes, which means the same dangerous act draws nothing or a ban depending on luck.

The 2026 change: penalties weigh less on the season

For 2026, umpires can still award event penalty points, but their effect on the championship standings was reduced.

This is a considered correction. A penalty that materially damages a season makes the umpires’ seven- second decisions too consequential — and a seven-second decision, however good the data, cannot carry that weight.

Keeping the penalty sharp within the event and softening it across the season matches the sanction to the confidence available. The umpires are certain enough to change a race. They are not certain enough to change a championship.

That is an unusually honest piece of rule-making: a sport calibrating its punishments to the reliability of its own officiating rather than to the severity of the offence.

For the underlying rules the sport is built on, see sailing’s right of way rules, Olympic sailing formats, and the America’s Cup deed of gift.