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.