http://www.legislation.gov.uk/ukpga/1985/22/section/7Dangerous Vessels Act 1985An Act to empower harbour masters to give directions to prohibit vessels from entering the areas of jurisdiction of their respective harbour authorities or to require the removal of vessels from those areas where those vessels present a grave and imminent danger to the safety of any person or property, or risk of obstruction to navigation; to enable the Secretary of State to give further directions countermanding those first-mentioned directions; and for connected purposes.1985-05-23texttext/xmlenStatute Law Database2015-09-10Expert Participation2015-03-12 7In this Act—“harbour” and “harbour authority” have the respective meanings given to them by section 57 of the Harbours Act 1964;“harbour master” includes any dock master or pier master who is not a subordinate of a harbour master and any deputy or assistant of a harbour master or of such a dock master or pier master;“vessel” includes—aa ship or boat, or any other description of craft used in navigation;ba rig, raft or floating platform, or any other moveable thing constructed or adapted for floating on, or partial or total submersion in, water; andca seaplane, a hovercraft within the meaning of the Hovercraft Act 1968 or any other amphibious vehicle.1964 c. 40. 1968 c. 59.