The powers of the authority under this part—
(a) may only be exercised in relation to Gold Coast waters; and
(b) must be exercised subject to the powers of each of the following—
(i) the general manager under part 14A of the Transport Operations (Marine Safety) Act 1994;
(ii) a harbour master under the Transport Operations (Marine Safety) Act 1994;
(iii) the general manager, including the general manager operating as the marine pollution controller, under part 12 of the Transport Operations (Marine Pollution) Act 1995.