Not a lot of marine traffic out by the Space Coast there PF. Cruise ship HARMONY OF THE SEAS is anchored out in international waters. Just normal looking merchie traffic out there, at least in range of the AIS receivers. Not sure what those P-8s would be looking for.
Thus the AIS receiver issue, turn the systems off from the bridge and an entire amphib fleet could do what it wanted out there and nobody would know. One of those it gotta "squawk" for me to find it.
What are the names of the Krassenstein brothers? Those should work