Paragraph 2 Temporary Restrictions on Navigation within the Rhu Narrows Restricted Channel
Where it is necessary for any naval vessel and/or auxiliary to proceed to or from a Crown Establishment or to be turned, moved, berthed or docked within the dockyard port, the Queen’s harbour master may direct that no person shall:
enter, pass through or remain in the Rhu Narrows Restricted Channel;
cause or permit any vessel or thing to enter, pass through or remain in the Rhu Narrows Restricted Channel.
Where any such direction is made, notice of the direction—
shall be broadcast by the Queen’s harbour master on VHF channel 73 from time to time during the period in which the direction is in force, and
shall be indicated by the illumination of a red light above two green lights supplemented by a red rectangular flag with a white diagonal bar displayed on any naval vessel or auxiliary within the Rhu Narrows Restricted Channel and at masts at the following locations:
the Port Control Building at Faslane;
Rhu Hard;
the DG Range building adjacent to Green Isle; and
the Navy Buildings, Greenock.