TomTom Runner shows wrong speed while running — TomTom Community

TomTom Runner shows wrong speed while running

AudejoAudejo Posts: 2 [Apprentice Traveler]
edited January 2019 in Runner & Multi-Sport
My TomTom Runner often shows the wrong speed, as compared to others that I run with. Usually my speed is lower (too slow)
This morning I was in my boat at a steady pace of about 11 km/h. I was wearing my Runner, so I decided to check my speed.
Every second or so the speed fluctuated strongly, betreen 5:15 and 6:50 min/km, and quite often no speed was shown also.
About a month ago I noticed that when running around a particular block many times, at a pretty constant speed, while going N-S the speed was much higher then when going S-N, at least at 5 occasions..

When uploading the data, the numbers seem to be correct (both speed and distance).

Any suggestion what might be wrong?


  • tfarabaughtfarabaugh Posts: 16,734
    Search the forums for pace accuracy or instant pace and you will see this is an ongoing issue. No watch has true "instant pace". It is all computed in arrears and is a balance between responsiveness and smoothness. A longer lag time gives you smoother data but is slow to react. A short lag time gets faster responsiveness but choppier data. TomTom is slow to react to changes in pace because it applies a long smoothing period to produce smooth, non-choppy data. If you are running at a fairly steady pace you will not notice the lag. However, if you are doing intervals or sprints or changing speed a lot the lag can be become more apparent. This has been a complaint since the first version of the watch was released 4+ years ago and really has not changed much, so I would not expect much to change now. In their defense though, my Garmin is not much netter, it updates the pace faster but it bounces all over the place.

    I imagine this is not what you were hoping to hear but let me know if this answered your question. If it did, please mark it as a solution so other can look for it if they have the same question.
  • AudejoAudejo Posts: 2 [Apprentice Traveler]
    Hi, Thanks for your comment. But I am afraid that my issue is not covered here.
    My main problem is that I see the speed fluctuate strongly when going in a steady pace. So it looks as if there is no smoothing at all. The speed displayed changes every second or so, whereas my actual speed is pretty constant.
    Moreover, when I look at my watch, 9 out of 10 times it displays a speed which is more then 10% below that of people i'm running with, at the same pace.
    Does this means my watch is having an issue?
  • tfarabaughtfarabaugh Posts: 16,734
    At this point I would suggest calling Customer Support to see what they can do. They are able to more deeply investigate and diagnose problems than we can here on the user forum. To get the number for Customer Support, go to, choose Contact at the bottom, select the service required and the product name and click Contact Customer Care and then Phone Us. It will give you the phone number for the country your account is registered under (this can be changed by clicking the flag icon in the bottom right corner of the screen).

    I hope this helped answer your question. If so, please mark it as a solution so others can look for it if they have the same question.
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