Paragraph 12

The Secretary of State for Defence may with the approval of the Trinity House erect or place, maintain, renew, alter, discontinue or remove such lights, buoys, beacons or other marks (and any structure required to house the same) and take such other steps as may be necessary for the purpose of indicating to vessels or persons using the harbour the extent of the various areas referred to in this Schedule where activities of those vessels or persons are prohibited, restricted or constrained.