U.S. Maritime Limits & Boundaries Announcements

In 2011, the Office of Coast Survey completed a multi-year project to merge all of the regional maritime limits into a single seamless digital dataset. Because U.S. maritime limits change, based on accretion or erosion of the charted shoreline, Coast Survey, in conjunction with the U.S. Baseline Committee, continually maintains the dataset. When NOAA releases a new nautical chart the maritime limits and boundaries are updated as needed. This page highlights regional or local updates to the dataset.

September 13, 2013

Released version 4.1 with changes as follows:

updated 12nm and 24nm limits in the vicinity of Kuskokwim Bay, Alaska

July 22, 2013

Released version 4.0 with changes as follows:

updated 12nm, 24nm, and EEZ limits in several regions of Alaska
updated 12nm and 24nm limits in the Gulf of Mexico
updated 12nm, 24nm, and EEZ limits in the Atlantic Coast, near Massachusetts
updated 12nm, 24nm, and EEZ limits in the Pacific Northwest

July 20, 2012

Released version 3.1 with changes as follows:

updated 12nm, 24nm, and EEZ limits in several regions of Alaska

April 16, 2012

Released version 3.0 with changes as follows:

NEW links for downloadable data. NOAA has reformatted the dataset has been to better serve the user
updated 12nm, 24nm, and EEZ limits in Alaska
updated 12nm and 24nm limit lines in the Louisiana region of the Gulf of Mexico
updated limits in Puerto Rico following the release of a new chart