The Portland Harbour Revision Order 1997

10.—(1) The master of a vessel which—

(a) has been involved in a collision with any vessel or property, or has been sunk or grounded or become stranded, in the harbour;

(b) is within or about to enter the harbour and by reason of accident, fire, defect or otherwise is in such a condition as to affect its safe navigation or to give rise to danger to other vessels or property; or

(c) in any manner gives rise to an obstruction to a fairway,

shall give immediate notice of that fact to the harbour master and (as soon as practicable thereafter) provide the harbour master with full details in writing.

(2) Where the condition of a vessel is such that it is not or may not be seaworthy, the master shall not move the vessel except to clear the fairway or to moor or anchor in safety, otherwise than with the permission and in accordance with the directions of the harbour master.

(3) The harbour master may mark any vessel the subject of a notice given to him under sub-paragraph (1) above in any manner he considers appropriate.