4. The enactments mentioned in column 1 of Part A of Schedule 1 to this Order, and the statutory instruments mentioned in column 1 of Part B of Schedule 1 to this Order, shall have effect as if any reference therein in whatever terms to ships, vessels or boats or activities or places connected therewith included a reference to hovercraft or activities or places connected with hovercraft, subject to the modifications (if any) contained in column 3 of Parts A and B respectively.