# The Dockyard Port of Plymouth Order 2020, Paragraph 7: Shapes and lights marking an exclusion zone


(1) When an exclusion zone is in effect around a vessel under paragraph 6, the vessel must while in the dockyard port display—
(a) two black diamond shapes vertically disposed, between sunrise and sunset; and
(b) two all-round flashing red lights at the masthead horizontally disposed—
(i) between sunset and sunrise; and
(ii) at any other time when there is restricted visibility.
(2) This paragraph does not apply to submarines.

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Source: https://www.legislation.gov.uk/uksi/2020/1261/schedule/2/paragraph/7 (the official version)
Page: https://openlegislation.uk/dockyard-port-of-plymouth-order-2020/schedule-2/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.