nuh uh!
Not as confused as me.
In the '50's I though it was "the 3 mile limit". Meaning, in coastal States where gambling was illegal, all a vessel had to do was travel more than 3 miles off shore. Beyond that limit was considered international waters ("high seas"*) where State gambling prohibitions did not apply.
Then, still in my childhood, the 3 mile limit became the 12 mile limit.
Now it's 200?
I don't have the information.
But I suspect there may be international right-of-way standards, exceptions to a more standard distance from shore limitation. *
https://en.wikipedia.org/wiki/International_waters
"The
three-mile limit refers to a traditional and now largely obsolete conception of the
international law of the seas which defined a country's
territorial waters, for the purposes of trade regulation and exclusivity, as extending as far as the reach of
cannons fired from land.
[1]"
https://en.wikipedia.org/wiki/Three-mile_limit **
"Territorial sea is a belt of sovereign water that extends at most 12 nautical miles (22 km; 14 mi) from the
baseline of a coastal state,
[6] including the
airspace over and seabed below it. Although the territorial sea is sovereign territory, foreign ships (military and civilian) are allowed
innocent passage."
https://en.wikipedia.org/wiki/Territorial_waters#Territorial_sea
** The "
Maritime zones under international law" graphic at this link may help.