I can only image the frustration of someone lost at sea watching one of these slowly drift right passed them and no way to get on board and no crew to signal for help.
You'd want cameras to track when anything even remotely in sight is moving unexpectedly. Anything coming close would be reported to the coast guard/navy.
There'll be heavy monitoring on these ships, even just for liability issue in case some dumb guy in a yacht sails right into them and tried to sue.
ALL vessels in the future may need AIS transponders.
http://en.wikipedia.org/wiki/Automatic_Identification_System