# The Portland Harbour Revision Order 1997, Paragraph 7


(1) The master of a small vessel which is not confined to a fairway shall not make use of the fairway so as to cause obstruction to other vessels which can navigate only within the fairway; and when navigating across a fairway or through an entrance to the inner harbour, he shall do so by the shortest possible route that will avoid such obstruction.
(2) The master of a small vessel shall not hamper the safe passage of any vessel greater than 20 metres in length which is in, entering or leaving a fairway or which is under way within the inner harbour.

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Source: https://www.legislation.gov.uk/uksi/1997/2949/schedule/1/paragraph/7 (the official version)
Page: https://openlegislation.uk/portland-harbour-revision-order-1997/schedule-1/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.