# The Portland Harbour Revision Order 1997, Paragraph 14


No person shall use a whistle within the harbour except—
(a) as a signal of distress;
(b) to prevent collision;
(c) in the case of fog; or
(d) with the prior permision of the harbour master, for the purpose of—
(i) the management of a race or any similar event;
(ii) the training of a person in the use of a small vessel; or
(iii) testing the whistle.

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Source: https://www.legislation.gov.uk/uksi/1997/2949/schedule/1/paragraph/14 (the official version)
Page: https://openlegislation.uk/portland-harbour-revision-order-1997/schedule-1/paragraph-14
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.