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The Forerunner 255 Underestimates My Speed

9148443
3 days ago

I recently replaced a Forerunner 245, which I gave to my partner, with a Forerunner 255.
I have three complementary reasons to believe that the Forerunner 255 underestimates my speed:
* The Forerunner 245 assigns my partner a higher speed than the Forerunner 255 assigns me, even though I'm running slightly faster than her.
* The speed assigned to me by the Decat' Coach app, which I use alongside the Forerunner 255, consistently assigns me a higher speed than the Forerunner 255.
* The Forerunner 255 assigns me speeds lower than the Forerunner 245.
Have other users experienced this type of problem?
How can I fix this?

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  • 0 2 days ago

    1. Is it about speed(m/s) or pace(min/km)? 

    2. What is "assigned speed"? 

  • 0 2 days ago

    @ global-local
    Thank you for taking an interest in my problem.
    * I'm talking about speed (km/h) and not pace (mn/km).
    * I'm referring mainly to Nordic walking, which I do at average speeds of around 6 km/h over 10 km to 18 km.
    * Since I posted my previous message, I've been wondering whether my problem isn't due to the fact that I'm using at the SAME TIME:
        * the Forerunner 255 watch (and the Garmin Connect app)
        * the Decat'Coach app, which also measures my speed.

  • 0 2 days ago in reply to 9148443

    I assume it is an outdoor activity, so you using a GNSS data to track your speed etc. Have you checked that a fr255 does data writing every second, not "intelligent?"

  • +1 2 days ago in reply to global_local

    @ Global-local,
    Oui, c'est une activité de plein air.
    Oui, ma Garmin 255 était réglée sur « enregistrement intelligent ».
    Je l'ai réglée sur « enregistrement toutes les secondes ».
    J'ai lu que cela consomme plus de batterie, mais comme nos marches nordiques ne durent pas plus de trois heures (sans arrêt), ça ne devrait pas poser de problème.
    Par contre, la Garmin 245 était déjà réglée sur « enregistrement toutes les secondes ».
    Je suis donc quasiment certain que vous avez résolu mon problème.
    Merci beaucoup.