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COLREGS Demarcation Lines

Published by Office for Coastal Management | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: August 02, 2026 at 11:42 PM | Dataset Last Updated: May 16, 2019 at 12:00 AM
U.S. collision regulation boundaries delineate those waters upon which mariners shall comply with the International Regulations for Preventing Collisions at Sea, 1972 (72 COLREGS) and those waters upon which mariners shall comply with the Inland Navigation Rules. The waters inland of these lines are subject to the Inland Navigation Rules Act of 1980. The waters outside these lines are subject to the International Navigation Rules of the International Regulations for Preventing Collisions at Sea, 1972 (COLREGS). The Coast Guard has the legal authority to effect regulatory changes to COLREGS. Records in this database are derived from descriptions published in the Code of Federal Regulations Title 33, Part 80 and are for planning purposes only.

Resources

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  • https://marinecadastre.gov/downloads/data/mc/COLREGSDemarcationLine.zip

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  • https://marinecadastre.gov/data/

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  • GCMD Keyword Forum Page

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  • Full Metadata Record

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  • NOAA Office for Coastal Management Website

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