# The Dockyard Port of Plymouth Order 1999, Paragraph 18: Diving signals


(1) If the size or construction of a craft or vessel engaged in diving operations makes it impracticable to exhibit the shapes prescribed in Rule 27(d) of the Collision Regulations, a rigid replica of the International Code Flag “A” not less than 600 millimetres in height shall be exhibited and measures taken to ensure all-round visibility, such replica to be illuminated between sunset and sunrise on the approach of other vessels.
(2) Free swimming divers are to be marked by short-scope orange marker buoys, such buoys to be lit between sunset and sunrise with a white or amber light.

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Source: https://www.legislation.gov.uk/uksi/1999/2029/schedule/2/paragraph/18 (the official version)
Page: https://openlegislation.uk/dockyard-port-of-plymouth-order-1999/schedule-2/paragraph-18
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.