I think this has biggest advantage in military submarine communications.<p>You launch a drone underwater. Drone flies off, sends radio message, records another from headquarters. Then flies to preprogrammed place. Then dives to another preprogrammed place and is recovered by sub.<p>This would me major improvement over communication buoys. Currently when buoy is transmitting, you can guess that the sub is 0,5km away in the general direction of movement of the buoy.