# The Portland Harbour Revision Order 1997, Paragraph 59


No person, being the master of a vessel propelled by an internal combustion engine, shall use that vessel in the harbour unless the engine is fitted with a silencer or such other apparatus suitable and sufficient for reducing as far as may be reasonable the noise caused by the escape of the exhaust gases from the engine.

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Source: https://www.legislation.gov.uk/uksi/1997/2949/schedule/1/paragraph/59 (the official version)
Page: https://openlegislation.uk/portland-harbour-revision-order-1997/schedule-1/paragraph-59
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.