One other aspect to consider : who's doing the detecting / tracking of these?
Case in point : say the military has long duration drones watching, and picks up a loitering ship. The military more than likely has very strict Rules Of Engagement, and at best can only pass the information along to someone in the civilian sphere. More than likely would go to the Coast Guard, but
a. how long does that message take to be recieved?
b. how long does it take between reciept of message and someone acting on it?
I've no expertise in this field, but I'm sure we're all more than aware what kind of nightmare one bureaucratic area is. I don't EVER want to have to deal with two or more...
My internet 00000010bits, which I hope intelligently contributes to the conversation.
Regards