when i run, I use both the native outdoor running app and mapmyrun. I do this to ensure accuracy of the miles ran and mapmyrun offers an actual route on a map. Ive noticed that the native running app is always quite a bit behind mapmyrun. Today i ran 2 miles and there was a discrepancy of a 1/4 mile! The native running app was behind. So I get home and go to the website runmyroute to verify which app is wrong. Sure enough the mapmyrun is spot on. I always run with my phone in hand so the GPS shouldn't be an issue for the watch. I also have tried only using the native running app in case the two apps were messing the GPS up. It's always the same. I'm surprised I haven't seen more about the accuracy issues I'm having here. Anyone else have the same issues? I am ok with a little difference, but a 1/4 mile difference in only a 2 mile run is HUGE! Thanks in advance for any replies.