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Notices to Mariners

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 Many of these warnings are of a temporary nature, but others may remain in force for several weeks and may be superseded by Notices to Mariners.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


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

RYA SafeTrx is an app for both Android & Apple iOS smartphones that allows you to track your journey (in UK territorial waters) 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.

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