Key components of the changes proposed by this bill include providing a power for the Minister of Transport to make marine protection rules in relation to Annex VI substances. The Maritime Transport Act 1994 sets out the purpose for which the Minister may make marine protection rules. The bill inserts an additional purpose of prescribing requirements relating to the prevention of air pollution for ships for the purpose of implementing Annex VI, providing "a power for the Director of Maritime New Zealand to conduct inspections and audits in relation to Annex VI requirements". This is in addition to the existing power of the Maritime Transport Act 1994 giving the director the power to conduct inspections and audits "for matters other than in relation to Annex VI", providing a power for the director of Maritime New Zealand "to detain ships and seize marine protection products that are in contravention of Annex VI requirements" and exercise related powers such as imposing conditions and prohibitions. These powers expand the existing powers of detention and seizure in the Maritime Transport Act so as to prevent air pollution from ships and to facilitate implementation of Annex VI.