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Maximum speed

Hello,

I've recently received a Garmin Edge 830.

So far, I've used it four times & there's an issue with the maximum speed:

  1. 214.4 km/h
  2. 212.6 km/h
  3. 172.6 km/h
  4. 213.8 km/h
    My GPS track is correct; all others datas also.
    Any idea why I'm having this problem?
    Any idea on won't to "erase or delete" those speeds?
    Many thanks
    eric