SpaceX is almost certainly using an ILS-type radio system for the final 100 meters, both on the boat and on land. GPS just isn't quite good enough, especially o

SpaceX is almost certainly using an ILS-type radio system for the final 100 meters, both on the boat and on land. GPS just isn't quite good enough, especially out on the ocean where there are no WAAS base stations to cover up GPS' flaws.