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 Many of these warnings are of a temporary nature, but others may remain in force for several weeks and may be superseded by Notices to Mariners.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) 
Argyll & Bute Council Lymington Harbour Commissioners 
Belfast Harbour  Manchester Ship Canal  
Bembridge Harbour  Medway Ports 
(Port of) Blyth  Milford Haven Port Authority 
(Port of) Bridgwater  Newhaven Port Authority
Bristol (City Council)  Newlyn Harbour  
Bristol Port Company  Orkney Harbours 
Brixham Harbour  Padstow Harbour
Broads Authority  Paignton Harbour  
Caernarfon Harbour Trust  Plymouth (QHM) 
Cardiff Harbour Authority Poole Harbour Commissioners 
Cattewater Harbour  Portland Port 
Chichester Harbour  Portsmouth (QHM)
Clydeport  (Port of) Ramsgate  
Comhairle nan Eilean Siar   Rye Harbour
Cowes Harbour Commission St Mary's Harbour 
Crouch Harbour Authority  Salcombe Harbour Authority 
Dart Harbour  (The Port and Haven of) Sandwich 
(Port of) Dover  Scarborough Harbour
Falmouth Harbour Commissioners  Scrabster Harbour  
Folkestone Harbour  Severn VTS (ABP) 
Forth Ports  Shoreham Port
Fowey Harbour  Sullom Voe, Shetland 
Gloucester Harbour Trustees   Southampton VTS (ABP)
Guernsey Harbours Southwold Harbour 
(River) Hamble  (Port of) Sunderland 
Harwich Haven Authority  Teignmouth Harbour
Holyhead Port  Torquay Harbour
Humber Estuary Services  (Port of) Truro
(Port of) Ipswich Weymouth Harbour 
Isle of Man  Whitby Harbour
Jersey Harbours  Yarmouth Harbour 


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.