"To ensure the safety of the divers and other workers involved in this operation, no unauthorised vessel may enter the temporary Moving exclusion zone, the first of which extends out 500 metres from the barge RMG500 during the transit from Astrolabe Reef towards Motiti Island while transporting pieces of the Rena accommodation block."
Anyone found breaching the zone will be liable to a fine or prosecution, Ms Roberts said.
The order applies to all vessels, except those authorised by the harbour master or the duty salvage master.
The order remains in force until Rena accommodation block transfer and removal operations are completed, Ms Roberts said.
Rena salvors are waiting for near-perfect weather and sea conditions to cut and lift the 700-tonne accommodation block from the sunken stern section of the sunken ship.