What kind of edge?
Didn't we learn in the Vietnam War that technology gave the U.S. no edge. Apparently not.
To say that GPS gives us an "edge" is to presume the other side is fighting the same kind of war as we are. The Viet Cong weren't. The "Taliban" are not now.
News item today: Amputations for American fighting personnel in the Middle East wars are much higher than in any previous U.S. war. How's GPS going to stop IEDs (road-side bombs)?