What advice should the master of a ship in an offshore oil or gas production area give to watchkeeping OOWs about steaming close to installations?

Those which project above the sea surface at any state of the tide, including those being constructed or dismantled, are protected by statutory 500-metre safety zones around them. In general, all vessels are prohibited from entering safety zones, and entry by an unauthorised vessel makes the owner, master and others who have contributed to the offence liable to a fine or imprisonment or both.