menzies
Guru
Friend of mine took his boat up the St John's river..... He was able travel only so far before he was contacted via VHF and told, in no uncertain terms, Turn around.
The St John's is a major commercial waterway so unless there were special rules in place in the immediate aftermath of 9/11 he should have been fine.
However they do get very nervous if you pass too close to the security boom on the south side of the river by the naval base.
(Plus he probably went down the river not up! )