Coastal Waters (State Powers) Act 1980

For the purposes of this Act, the limits of the territorial sea of Australia shall be the limits existing from time to time, ascertained consistently with the Seas and Submerged Lands Act 1973 and instruments under that Act and with any agreement (whether made before or after the commencement of this Act) for the time being in force between Australia and another country with respect to the outer limit of a particular part of that territorial sea.

If at any time the breadth of the territorial sea of Australia is determined or declared to be greater than 3 nautical miles, references in this Act to the coastal waters of the State do not include, in relation to any State, any part of the territorial sea of Australia that would not be within the limits of that territorial sea if the breadth of that territorial sea had continued to be 3 nautical miles.