Section 3 of the Principal Act is amended as follows:(a) by omitting the definition of coastal waters and substituting the following definition:coastal waters means (a) any part of the territorial sea of Australia adjacent to the State within 3 nautical miles of the baseline by reference to which the territorial limits of Australia are defined for the purposes of international law; and(b) the marine or tidal waters on the landward side of any territorial sea of Australia adjacent to the State;(b) by inserting the following definition after the definition of owner :port company means a company formed under the Port Companies Act 1997 ;