native running app not very accurate?

Discussion in 'Apple Watch' started by Applenoob34, Sep 25, 2015.

  1. Applenoob34 macrumors 6502

    Feb 18, 2014
    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.
  2. exxxviii macrumors 65816


    May 20, 2015
    There are a number of threads on this topic. The watch measures short compared to measured distances. In my case, it is consistently about 2% shorter than the actual distance. Other posts are similar for accuracy. In my case, I am comparing the AW distances to a known distance of 5.07 miles as measured by two Garmin dedicated GPS watches with a standard deviation less than 0.01 miles.

    There are a few posts with differences higher, like yours, but I suspect that the baseline distances are inaccurate.
  3. Applenoob34 thread starter macrumors 6502

    Feb 18, 2014
    By baseline differences your saying the mapmyrun and routemyrun distances are inaccurate? Or are you saying the native running app baseline is? I can't believe two separate sources are wrong and the native running app is right.
  4. exxxviii macrumors 65816


    May 20, 2015
    Sorry... The baseline is the reference distance you are comparing to. So, that would be mapmyrun and routemyrun.

    In my experience with GPS-based running apps and devices over many years and thousands of miles, I have found that phone-based running apps are pretty inaccurate. They can be close at times, but they are a crap shoot compared to a dedicated GPS watch.
  5. Applenoob34 thread starter macrumors 6502

    Feb 18, 2014
    Gotcha. I'll try driving the distance to get a better idea. Thanks!
  6. Applenoob34 thread starter macrumors 6502

    Feb 18, 2014
    Small update......

    So I drove the route I usually run today and found that the distance is the same as the mapmyrun app and the online runmyroute. That's now 3 different sources confirming the distance I ran. It's safe to say my apple watches native outdoor running app is off. I doubt I'll do anything about it, but just wanted the rest of you to make sure your checking your distances to confirm accuracy. I can say it used to be more accurate if I remember correctly. If your a serious runner or look at your splits very often, I would use another app for better accuracy.
  7. MBHockey macrumors 68040


    Oct 4, 2003
    New York
    mine was inaccurate at first. but after a few 6 mile runs with my iPhone and watch it seems very well calibrated and I trust it. been running with GPS watches for years.
  8. BarracksSi Suspended


    Jul 14, 2015
    What I keep wondering is whether two apps can read GPS data at the same time.

    I've tried it before, using Nike+ Run and Asics's running app together, and only the first-launched app was able to gather GPS data. The second-launched app never made it from my starting point.

    I'd say to try again (if you haven't already, that is) using only the AW's native app and not launching MapMyRun or any other running app.

    That's my guess, anyway.
  9. Mad Mac Maniac macrumors 601

    Mad Mac Maniac

    Oct 4, 2007
    A little bit of here and a little bit of there.
    I agree it's weird that there are discrepancies from within the same GPS unit... however, from my own experience they have been much, much closer than your experience. I'm a pretty avid runner (just finished my second half marathon since owning the Apple watch) and I use the Nike+ app. I think for the first month or so the distances were a bit off from each other (Maybe about 0.15mi off on a 3.5 mi run), but they have definitely closed the gap. In fact both half's that I've ran (13.1 mi) they have been spot on with each other. Today I had 13.2mi on Nike+ and 13.19 on the apple watch.
  10. BlueMoon63 macrumors 68020

    Mar 30, 2015
    I'm in agreement with this post. I normally run on my treadmill and it was different than the watch but I had no idea who was right and who was wrong or if they were both wrong. I went to a track and over the course of about 2 weeks, I calibrated the watch with the GPS on the phone knowing the distance was accurate. After 2 weeks and 6 recordings, the watch is now very accurate. I ran 12 laps and the watch said 2.99 miles. Now I feel like the watch is right and the treadmill is wrong but I really don't care. I did some runs and walks outside in a very wide open 1 mile stretch and the watch is spot on whether I am walking or running.
  11. bbplayer5 macrumors 68030

    Apr 13, 2007
    I found my distances to be off from what I was used to, but then realized it is probably more accurate than what I was used to.

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