What I love about GPS is that it's so pervasive that maps have basically vanished overnight. And in 1000 years there will be no physical evidence of it.
The only thing future archaeologists would be able to tell is that one day, we stopped making maps, and suddenly we started listening to the stars.
That's even cooler, would be pretty spooky if modern historical records and knowledge got lost and then all that was left was a gap in written information and several hundred large man made objects that can be seen with basic optics or even the human eye under the right conditions.