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A red flag on the boat.
Also known as: Red protest flag
The signal flag meaning this boat intends to protest another for a rule breach.
Signals this boat intends to protest another for a rule breach.
Contexts: Public information
Flown by a competitor rather than by an official, which makes it one of very few signals in any sport shown by one participant to accuse another — the sport polices itself and the flag is how.
Contexts: Public information
A plain red rectangular flag, small enough to be handled aboard, tied conspicuously in the rigging of the protesting boat at the first reasonable opportunity after the incident.