(1) An opt - in declaration for a vessel ceases to be in force, unless sooner revoked:
(a) at the end of the period, if any, specified in the declaration; or
(b) when the vessel ceases to have Australian nationality.
(2) AMSA must revoke an opt - in declaration for a vessel if AMSA is requested to do so by the owner, or any of the owners, of the vessel and is satisfied of the matters prescribed by the regulations.
(3) AMSA may vary an opt - in declaration for a vessel if:
(a) AMSA is satisfied that the name or any other details of the vessel have been changed since the making of the declaration; and
(b) AMSA is satisfied that it is appropriate to vary, rather than revoke, the declaration.
(4) AMSA may revoke an opt - in declaration for a vessel if:
(a) AMSA is satisfied that the vessel no longer exists or has been lost; or
(b) AMSA is satisfied that the name or any other details of the vessel have been changed since the making of the declaration and that it is appropriate to revoke, rather than vary, the declaration; or
(c) AMSA is no longer satisfied as mentioned in subsection 25(2) in relation to the vessel.