NOAA's Office of Coast Survey

NOAA's Office of Coast Survey is the federal agency responsible for mapping and charting the U.S. coastal waters. It provides critical navigational charts and hydrographic data that ensure safe shipping, boating, and marine operations. By collecting detailed information about underwater landscapes, tides, and currents, Coast Survey helps prevent accidents and supports maritime commerce, environmental protection, and national security. Its work enables mariners and the public to navigate safely and confidently across U.S. waters.