Notice to mariners
Advisory document updating navigational safety information / From Wikipedia, the free encyclopedia
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A notice to mariners (NtM[1] or NOTMAR,[2]) advises mariners of important matters affecting navigational safety, including new hydrographic information, changes in channels and aids to navigation, and other important data.[3]
![]() | The examples and perspective in this article may not represent a worldwide view of the subject. (December 2010) |
Over 60 countries which produce nautical charts also produce a notice to mariners. About one third of these are weekly, another third are bi-monthly or monthly, and the rest irregularly issued according to need.[citation needed] For example, the United Kingdom Hydrographic Office issues weekly updates.[4][when?]