Notices to Mariners
After nautical charts and publications have been published, sea routes, coasts, ports, and more continue to change naturally and artificially. Because these changes influence the safety of navigation directly and indirectly, it is necessary to swiftly and accurately provide vessels with information on such changes in order to ensure safe navigation and prevent marine accidents. The notices to mariners help mariners maintain their nautical charts and publications up to date. They are issued once a week and promulgated via various channels, including the Internet.