Just noticed yesterday when I used my GPS for the first time since getting the new iPhone 7 - it had a lot of trouble getting a lock on my location. Using Waze - it periodically would say "No GPS. Try going outdoors..." And it sometimes it would find me, then sometimes it would lose me. Google and Apple Maps did the same thing - sometimes it would have me driving diagonally across streets in a neighborhood when I was cruising down the highway. Not sure if Software or Antenna issue. I did just notice that for some reason i'm on 10.0 and not 10.0.1 so I just updated and will try it again today. But posting now in case anyone is experiencing anything similar (or has resolved similar issues).