C5 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.'