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A notice to mariners (NTM〔Web site uses abbreviation 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. ==United States== 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. The Notice consists of a page of Hydrograms listing important items in the Notice, a chart correction section organized by ascending chart number, a product catalog corrections section, a publications correction section, a summary of broadcast navigation warnings, and a page of additional miscellaneous information. It is the responsibility of users to decide which of their charts and publications require correction. Mariners are requested to cooperate in the correction of charts and publications by reporting all discrepancies between published information and conditions actually observed and by recommending appropriate improvements. A reporting form is provided in the back of each ''Notice to Mariners''. Issue No. 1 of each year contains important information on a variety of subjects which supplements information not usually found on charts and in navigational publications. This information is published as Special Notice to Mariners Paragraphs. Additional items considered of interest to the mariner are also included in this Notice. Much of the data in the U.S. ''Notice to Mariners'' is obtained from foreign notices. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「notice to mariners」の詳細全文を読む スポンサード リンク
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