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. This includes chart updates, changes in buoyage and prior warning of activities such as dredging.

Notices to Mariners are issued by several organisations, including the UK Hydrographic Office, Trinity House and local harbour authorities. You can often find Local Notices to Mariners online, and many harbour authorities provide email updates you can subscribe to.

ADMIRALTY Small Craft Chart Service, a division of the UK Hydrographic Office, provides regular Notices to Mariners for keeping Small Craft Charts up to date. You can find information on the ADIMRALTY Small Craft Charts web page.

Imray has a similar corrections service on its website.

The UK Hydrographic Office (UKHO) publishes radio navigation warnings for NAVAREA 1 and the UK coast on the ADMIRALTY website. Many of these warnings are temporary, but others can remain in force for several weeks. These might then be superseded by Notices to Mariners.

If you are aware of a source for Notices to Mariners not listed below, please let us know by emailing

ADMIRALITY Small Craft Charts  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 

Jersey Harbours

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 St Mary's Harbour 
Crouch Harbour Authority  Salcombe Harbour Authority 
Dart Harbour  (The Port and Haven of) Sandwich
Dogger Bank 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)
Glasson Dock Southwold Harbour 
Gloucester Harbour Trustees  
(Port of) Sunderland 
Guernsey Harbours Teignmouth Harbour
(River) Hamble  Torquay Harbour
Harwich Haven Authority (Port of) Truro
Holyhead Port Authority Weymouth Harbour 
Humber Estuary Services  Whitby Harbour
(Port of) Ipswich Yarmouth Harbour
Isle of Man   


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

RYA SafeTrx provides all recreational boat users, including 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 to inform HM Coastguard of their trip plans and dynamic location in the event of distress.

Available for Android and iOS, the RYA SafeTrx 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.