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Notice to Mariners

Notices to mariners advise of important matters affecting navigational safety, including new hydrographic information, changes in channels and aids to navigation, and other important data.  Notices to Mariners are issued from a number of different sources, such as the UK Hydrographic Office, Northern Lighthouse Board and Local Harbour Authorities.  Notices to Mariners may contain a variety of information such as chart updates, changes in buoyage, prior warning of activities such as dredging, exclusion zones, harbour closures and byelaws etc. 

For a comprehensive update you should also check the Harbour Authority, sailing club and developers’ websites for notices relating to the area in which you intend to travel. Some of these have been linked below for your convenience.

Northern Lighthouse Board Highland & Moray Sailing
Port of Inverness Port of Cromarty Firth

In the United Kingdom the UK Hydrographic Office (UKHO) issues weekly updates and provides a free searchable Notices to Mariners facility. This enables you to search the Notices to Mariners service for updates to Admiralty Charts by Chart number or by NM number.  Users should read the Guidance Notes as issued by UKHO before using the service.

Admiralty Leisure (the leisure division of UKHO) have 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 Radio Navigational Warnings for NAVAREA1 and the UK Coast on its web-site. Many of these warnings are of a temporary nature, but others may remain in force for several weeks and may be superseded by Notices to Mariners.