3. The limits within which the Commissioners shall have jurisdiction for the purposes of pilotage under Part I of the Pilotage Act 1987 shall include (in addition to the harbour) the area coloured pink on the signed plan, being so much of the area outside the harbour as lies within the following imaginary straight lines—
(a)a line drawn due west (true) for a distance of 1 nautical mile from a point at latitude 54 degs 30'.1N, longitude 03 degs 38'.1W;
(b)a line drawn due west (true) for a distance of 1.88 nautical miles from a point at latitude 54 degs 36'.7N, longitude 03 degs 34'.1W; and
(c)a line drawn between the seaward ends of the lines mentioned in paragraphs (a) and (b) above.