Article 2 of this Order establishes, under section 22 of the Petroleum Act 1987, safety zones having a radius of 500 metres from the specified point around the four installations (which are subsea installations) specified in the Schedule to this Order to be stationed in waters to which section 21(7) of that Act applies (these include territorial waters and waters in areas designated under section 1(7) of the Continental Shelf Act 1964 (c. 29)).