(1) The regulations may declare that, for the purposes of describing, in a title or other instrument under this Act, the position on the surface of the Earth of a point, line or area:
(a) a specified datum is the current datum ; and
(b) that datum replaces the previous datum.
(2) The previous datum is:
(a) if a datum is the first datum declared to be the current datum under subsection (1)—the Australian Geodetic Datum; or
(b) in any other case—the datum that was the current datum immediately before the changeover time.
Note: Under clause 4 of Schedule 6 to this Act, a declaration under subsection 150N(1) of the repealed Petroleum (Submerged Lands) Act 1967 has effect as if it were a declaration under subsection (1) of this section.
(3) The changeover time is the time when the declaration takes effect.