From: Tag:boundary=maritime - OpenStreetMap Wiki
If a country has defined the maritime borders of sub-national entities, this way should be included in boundary relations for these entities.
In the United States of America, NOAA nautical charts
specify in Note X:
"Within the 12-nautical mile territorial sea, established by Presidential Proclamation, some federal laws apply. The Three Nautical Mile Line, previously identified as the outer limit of the territorial sea, is retained as it continues to depict the jurisdictional limit of the other laws. The 9-nautical mile Natural Resource Boundary off the Gulf coast
, and Puerto Rico
, and the Three Nautical Mile Line elsewhere remain in most cases the inner limit of Federal fisheries jurisdiction and the outer limit of the jurisdiction of the states. The 24-nautical mile Contiguous Zone and the 200-nautical mile Exclusive Economic Zone were established by Presidential Proclamation. Unless fixed by treaty or the U.S. Supreme Court, these maritime limits are subject to modification."