Notice to mariners
 The front cover of a Notice to Mariners. |
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| Purpose: | Provide corrections to navigational publications and nautical charts. |
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| Publication Frequency: | Weekly |
| Published by: | National Geospatial-Intelligence Agency |
| Available Online: | Yes [1] |
A notice to mariners (NTM) advises mariners of important matters affecting navigational safety, including new hydrographic information, changes in channels and aids to navigation, and other important data.
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. For example, the United Kingdom Hydrographic Office issues weekly updates.
The U.S. Notice to Mariners is made available weekly by the National Geospatial-Intelligence Agency (NGA), prepared jointly with the National Ocean Service (NOS) and the U.S. Coast Guard. The information in the Notice to Mariners is formatted to simplify the correction of paper charts, List of Lights, Light Lists, United States Coast Pilots, and other publications produced by NGA, NOS, and the U.S. Coast Guard.
Information for the Notice to Mariners is contributed by: the National Geospatial-Intelligence Agency (Department of Defense) for waters outside the territorial limits of the United States; National Ocean Service (National Oceanic and Atmospheric Administration, Department of Commerce), which is charged with surveying and charting the coasts and harbors of the United States and its territories; the U.S. Coast Guard (Department of Homeland Security) which is responsible for the safety of life at sea and the establishment and operation of aids to navigation; and the Army Corps of Engineers (Department of Defense), which is charged with the improvement of rivers and harbors of the United States. In addition, important contributions are made by foreign hydrographic offices and cooperating observers of all nationalities.
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