The traveling by sea is a little bit of a loop hole around the CDC guidelines using the antibodies test. I’ve confirmed with multiple sources that it works. The best part about that is you do not have to plan your trip around making it to a testing clinic when you would rather be diving a reef.

Once you get to USVI there are no more requirements to enter back to the mainland. Unless your final destination requires it. I havnt heard of any states that do but I do know of some retirement communities that require a negative test.