This Practice Note explains the duties and powers of harbour authorities under legislation including the Merchant Shipping Act 1995 and the Pilotage Act 1987, including sources of powers and duties, dues, charges and open port duty, navigation, pilotage (CHAs), health and safety, the Port Marine Safety Code, dangerous goods, environmental protection, oil pollution, waste management, wrecks and dangerous vessels. It is part of a series of notes on ports and harbours.