Should You Get a GPS Running Watch, Fitness Tracker, or Smartwatch? | Wirecutter
GPS issue from phone or app? Nike app tracking via mapo vs. actual path run. : r/nikerunclub
Coros Pod 2 review – (Im)balancing act | T3
How Accurate is Nike Run Club?
How accurate is the Nike+ iPhone app in measuring distance? - Quora
Make it even better than Nike+” — How to filter locations (Tracking Highly Accurate Location in iOS Vol.5) | by Taka Mizutori | How to track user's location with high accuracy (iOS / iPhone) | Medium