Port Information

KHM Clyde is a Statutory Harbour Authority with powers conferred from The Clyde Dockyard Port of Gareloch and Loch Long Order (2011), the Faslane, Coulport and Rhu Narrows Byelaws (1986) and the Rhu Narrows Byelaws (1992).

HMNB Devonport

King's Harbour Master

What we do

KHM Clyde is accountable to the Secretary of State for Defence through the Director Submarines (Dir SM) and the Naval Base Commander (Clyde) with jurisdiction over the Clyde Dockyard Port of Gareloch and Loch Long.

The Authority has legal and operational responsibility for the movement of shipping within these areas. KHM can issue General Directions to any vessel within the jurisdiction for the purpose of Navigational Safety. This power is also delegated to specifically authorised deputies and assistants (including Harbour Controllers). 

These General Directions are to be construed in conjunction with the Clyde Dockyard Port of Gareloch and Loch Long Order 2011, Pilotage Directions and Clyde Warning Notices (Local Notices to Mariners).


Restricted Areas

The chartlet shows the approximate positions of the restricted areas. Accurate positions are on the relevant admiralty charts. The speed limits are shown also. The blue lines show the southerly limit of the Clyde Dockyard Port of Gareloch and Loch Long. Essentially all the water north of this line within the loch is under the jurisdiction of the King's Harbour Master.

Regardless of port closures or other activity, it is recommended that all vessels call KHM Clyde on VHF Ch 73 when approaching the Dockyard Port to inform the Harbour Controller of their intentions. This will allow the vessel to be fully informed of activity in the area. All vessels in the area will be tracked by the Harbour radar and monitored by the MOD police vessels, which form part of the security provision for the Harbour.

Port Closures


Faslane and Coulport

Three red lights vertically disposed.



These lights will be displayed at:

  • Faslane
  • Coulport EHJ
  • Baron's Point

Gareloch and Loch Long

If entering the Gareloch or Loch Long at any time or if in doubt, contact is to be made with the KHM Duty Controller on VHF Channel 73 or 01436 674321 (Extn 3555).

Loch Goil

The Experimental Facility within Loch Goil is used to conduct trials on warships of all shapes and sizes. When "Active", there is an associated traffic control measure set out within the notes to the appropriate Charts (see 3746 / 2131) and within the  South-West Coast of Scotland Pilot (NP 66A  Art 3.104).

Traffic Regulations. While trials are in progress in Loch Goil, the activation of vessel traffic control is indicated by the illumination of three fixed red lights displayed vertically apart at Maytime Barge (56 09.449N 04 54.049W) and Signal Raft (56 08.454N 4 53.637W)



Vessels wishing to navigate are to contact the QinetiQ Facility Control Room on Telephone: 0131 703474 or VHF Channel 69 (Call Sign GOLF XRAY ALPHA) when this signal is displayed.

Rhu Narrows

A red light above two green lights vertically disposed.




These lights will be displayed at: 

  • Rhu Hard
  • Rosneath Mast

Whilst these signals are displayed the Rhu Narrows are closed. A fuller explanation of all the prohibited activities is contained in Appendix IV to the Admiralty Sailing Directions (NP66A South-West Coast of Scotland Pilot).

Tide tables

This information is produced by permission of the UK Hydrographic Office. All times are given in Local Time and are adjusted for British Summer Time (BST) where appropriate.

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