Thanks.

I see what you're saying about the possible arc of Floridian waters
and I can't give a good reason why it couldn't be that way. But based
on the summaries of documents you provide, if the line doesn't just
go sraight south, it at the most runs 1 minute due southwest.
Basically there is no good reason for the Floridian arc not to exist
but it doesn't exist. And in my own opinion it makes more sense if
teritorrial waters of any entity work the way USGS understands it.
Internatioanlly accepted way to claim national waters - you draw a
line between the two most outsticking coast points then you go from
that line the whatever distance (usually 12nm) and that's where the
outer limit is (becauise it's kinda hard to set the exact border if
you try to religiously follow all the curves of the coast). the sea
border between two entities should be established by their agreement.
But then, nobody cares about water borders until they find oil.
And if you start thinking about exclusive economic water claims you
could could come up with more great borderpoints.
US maritime claims:
contiguous zone: 24 NM
continental shelf: not specified
exclusive economic zone: 200 NM
territorial sea: 12 NM