> That GPS signal is susceptible to fluctuations based upon which tower is “visible” (A-GPS). I’ve had it happen where I go through tunnel and the phones GPS th

> That GPS signal is susceptible to fluctuations based upon which tower is “visible” (A-GPS). I’ve had it happen where I go through tunnel and the phones GPS thinks I’ve magically run a mile in the opposite direction. Some of my Strava traces look like they are all scribbles. That might explain one of my rides having a spurious "cliff climb" where the altitude went bonkers. That being said, I lost interest in Strava when they killed the Bluetooth integration with my Wahoo TICKR. That was just another of the incessant reminders of why I can't trust tech companies anymore.