In establishing a port security zone, the Secretary must have regard to the purpose of the zone, and take into account:

(a) the existing physical features of the port; and
(b) the existing operational features of the port; and
(c) the views of:
(i) the port operator; and
(ii) each person who controls an area of land (including any buildings on the land) that is to be included within the boundaries of the zone.