May be something like, GPS + "Bluetooth pairing at destination". This could allow the fly-copter to lock onto the target when in vicinity of the original (or up

May be something like, GPS + "Bluetooth pairing at destination". This could allow the fly-copter to lock onto the target when in vicinity of the original (or updated) destination GPS coordinates. There seems to a bunch of seemingly plausible ways to do this, but the first group to work on the problem will surely solve it then patent the method.