(1) If AMSA is satisfied that a vessel is not constructed, equipped or operated in accordance with the Prevention of Pollution Convention (whether or not the vessel is required to be so constructed, equipped or operated), AMSA may give to the master or the owner of a vessel a written direction that requires one or more of the following:
(a) that the vessel not enter or use any port, or a specified port or specified ports, in Australia or the exclusive economic zone of Australia;
(b) that the vessel comply with specified requirements while it:
(a) is approaching, entering, or using any port, or a specified port or specified ports, in Australia or the exclusive economic zone of Australia; or
(b) is in or is leaving any port, or a specified port or specified ports, in Australia or the exclusive economic zone of Australia.
(2) AMSA may exercise its powers under subsection (1) in relation to a vessel only to the extent that AMSA is satisfied that it is necessary or expedient to do so for the protection of the environment.
(3) A direction under subsection (1) is not a legislative instrument.