So here is the issue in images, which is still very much present.
When I first got on the Subway, the GPS had absolutly no idea where I was - In fact it thought I was in San Francisco.
Then after about 2 minutes it updated and still had absolutely no idea where I was... in fact I was no where. (In actual fact I was at 42st. Times Sq.
Then 5 minutes later it decided I was somewhere in the upper west side, near home. I had left home approximately 25 minutes earlier. In actual fact, I was now at 14th street in the lower side of Manhattan.
Then all of a sudden, after leaving the subway and going to street level, I had time travelled from the Upper West Side 72nd street to 14th Street all within the same minute. Previously this was never an issue and the location would update at every stop along the subway.
Apple, this is an absolute joke. How is this still a problem over a month after the release of iOS 11. FIX IT!
Again, this does not only happen to me but our entire office, around 11000 devices are experiencing this issue - iPhone 6 -> 7 Plus