GPS has forever changed how we interact with our cities. If you get lost in a city today, you don’t look up at street signs, you look down at your phone. If you want to hail a cab, you signal your location by opening Uber rather than by waving your arms at the side of the road. If you want a restaurant recommendation, you ask Yelp for the best places nearby instead of asking your friends. We live in a world where GPS doesn’t just locate you on a map, it changes how you interact with the city around you.