SIGNALS BY UMPIRES
C5.1:
A green and white flag with one long sound means ‘No penalty.’
C5.2:
A blue or yellow flag identifying a boat with one long sound means ‘The identified boat shall take a penalty by complying with rule C7.’
C5.3:
A red flag with or soon after a blue or yellow flag with one long sound means ‘The identified boat shall take a penalty by complying with rule C7.3(d).’
C5.4:
A black flag with a blue or yellow flag and one long sound means ‘The identified boat is disqualified or has retired, and the match is terminated and awarded to the other boat.’
C5.5:
One short sound means ‘A penalty is now completed.’
C5.6:
Repetitive short sounds mean ‘A boat is no longer taking a penalty and the penalty remains.’
C5.7:
A blue or yellow flag or shape displayed from an umpire boat means ‘The identified boat has an outstanding penalty.’