Notices to Mariners

Notices to Mariners are issued from a number of different sources, such as the UK Hydrographic Office, Trinity House or Local Harbour Authorities.

Notices to Mariners contain important navigational information such as chart updates, changes in buoyage, prior warning of activities such as dredging, exclusion zones, harbour closures and byelaws etc.

Local Notices to Mariners are often available online and many harbour authorities allow you to subscribe for email updates as and when a new notice is published.

Admiralty Leisure (the leisure division of UKHO) has an web-based Leisure Notices to Mariners service, which has been specifically produced for Admiralty Leisure charts and folios. This details every chart on its own page and gives weekly updates of new information. Chartlets, if required, are available to download.

Imray has a similar corrections service on their website.

The UKHO publishes Navigational Warnings for NAVAREA1 and the UK Coast on its website. Many of these warnings are of a temporary nature, but others may remain in force for several weeks and may be superseded by Notices to Mariners.

Glasson Dock/River Lune Notices to Mariners are available by email from the Lancaster Port Commission.

If you are aware of a source for Notices to Mariners which is not listed below, please email

Admiralty Leisure  Langstone Harbour Board 
Imray  Looe Harbour 
Reeds Nautical Almanac  Lowestoft (ABP) 
Trinity House  Littehampton Harbour 
Northern Lighthouse Board  (Port of) Liverpool 
Commissioners of Irish Lights  (Port of) London Authority 
UKHO Navigational Warnings  Lowestoft (Broads Authority) 
CMAL (West Scotland) Lymington Harbour Commissioners 
Argyll & Bute Council Manchester Ship Canal  
Belfast Harbour  Medway Ports 
Bembridge Harbour  Milford Haven Port Authority 
(Port of) Blyth  Newhaven Port Authority
(Port of) Bridgwater  Newlyn Harbour 
Bristol (City Council)  Orkney Harbours
Bristol Port Company  Padstow Harbour
Brixham Harbour  Paignton Harbour 
Broads Authority  Plymouth (QHM)
Caernarfon Harbour Trust  Poole Harbour Commissioners
Cardiff Harbour Authority Portland Port 
Cattewater Harbour  Portsmouth (QHM)
Chichester Harbour  (Port of) Ramsgate
Clydeport  Rye Harbour
Comhairle nan Eilean Siar   St Mary's Harbour 
Cowes Harbour Commission Salcombe Harbour Authority 
Crouch Harbour Authority  (The Port and Haven of) Sandwich
Dart Harbour  Scarborough Harbour
(Port of) Dover  Scrabster Harbour  
Falmouth Harbour Commissioners  Severn VTS (ABP) 
Folkestone Harbour  Shoreham Port
Forth Ports  Sullom Voe, Shetland 
Fowey Harbour  Southampton VTS (ABP)
Gloucester Harbour Trustees   Southwold Harbour 
Guernsey Harbours (Port of) Sunderland 
(River) Hamble  Teignmouth Harbour
Harwich Haven Authority  Torquay Harbour
Holyhead Port  (Port of) Truro
Humber Estuary Services  Weymouth Harbour 
(Port of) Ipswich Whitby Harbour
Isle of Man  Yarmouth Harbour
Jersey Harbours   


Links to Notices to Mariners can also be found in the RYA SafeTrx app.

RYA SafeTrx is an app for both Android and Apple iOS smartphones that allows you to track your journey on your phone.

RYA SafeTrx provides all recreational boat users, particularly dinghy cruisers, PWC users, RIB users, canoers, kayakers, wind and kite surfers and smaller boat users with an easily accessible and simple to use means that can inform HM Coastguard of their voyage plans and dynamic location in the event of distress.

This app is freely available to anyone who wants to be safer afloat. It is free to download and there is no charge to use it.  Read more about the RYA SafeTrx app.