The chap in charge of a harbour. I say in charge deliberately because under an Act of Parliament now some 130 years old he has real authority. You must berth where he tells you, and move if he tells you. If you don’t move your boat he can move her – and charge you with the cost. By the same Act, a skipper who brings his boat into a port where harbour dues are payable must report his arrival to the harbourmaster within 24 hours. In short, a harbourmaster is master within his own harbour.