# The Portland Harbour Revision Order 1997, Paragraph 23


(1) The master of a vessel, other than a small vessel lying at a recognised mooring or anchorage, shall not, except where his vessel is lying aground, take any steps to render his vessel incapable of movement without first notifying the harbour master and, subject as aforesaid, shall at all times keep his vessel so loaded and ballasted and in such condition that it is capable of being safely moved.
(2) Where a vessel is at any time not capable of being safely moved by means of its own propulsive machinery, the master or owner shall inform the harbour master forthwith and give to him any further information which the harbour master may reasonably require.

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Source: https://www.legislation.gov.uk/uksi/1997/2949/schedule/1/paragraph/23 (the official version)
Page: https://openlegislation.uk/portland-harbour-revision-order-1997/schedule-1/paragraph-23
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.