The limits within which the Council 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) from the level of water at highest astronomical tide south of the harbour entrance on latitude 54°37 N to a point at longitude 3°37.3' W;
(b) a line drawn from that point northwards to a position latitude 54°39.1' N longitude 3°36.3' W being a point one nautical mile due west of Workington South Pier Head in longitude 3°34'.6 W;
(c) a line drawn northwards from that point to a position latitude 54°41 N longitude 3°35.3' W;
(d) a line drawn due east (true) on latitude 54°41 N from the last mentioned position to the level of water at highest astronomical tide north of the harbour entrance.