6.—(1) The undertaker must at or near the authorised scheme during the whole period of the construction, operation, alteration, replacement or decommissioning of the authorised scheme exhibit such lights, marks, sounds, signals and other aids to navigation, and take such other steps for the prevention of danger to navigation, as Trinity House may from time to time direct.
(2) The undertaker must notify Trinity House, in writing, as soon as reasonably practicable, of the progress of construction of the authorised scheme or any part of it and any aids to navigation established from time to time during construction.
(3) The undertaker must provide reports on the availability of aids to navigation periodically as requested by Trinity House.
(4) In case of injury to, or destruction or decay of, the authorised scheme or any part thereof the undertaker must as soon as reasonably practicable notify Trinity House and shall lay down such buoys, exhibit such lights and take such other steps for preventing danger to navigation as Trinity House may from time to time direct.