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The US Notice to Mariners corrects NGA and NOS charts using information collected from many sources, among them the Local Notice to Mariners published by the Mariners are requested to use the current editions of the nautical charts and The list contains all valid P and T messages sorted by chart number andThe NtMs that have been applied to your chart are listed on the chart's bottom left corner. NtMs are numbered from '1' onwards each calendar year and are You can do so by using the Notices to Mariners (NtMs). In the 'NtMs-database' you can select the changes to each nautical chart by week number or chart number.