GPS data in Strava upload?

[Alex]

You can read more here

Set up and use of TrainerDay. Why did I get low distance in strava?

I am set up on Tacx trainer and using app on iPhone with auto upload to Strava. I use Garmin Edge at same time so that I have workout data on Garmin Connect. Today I rode 40/20sec 2x10’FTP. Both the TrainerDay trainer and the Edge showed same Power, cadence and HR, but Strava recorded virtual ride with graphic up Monte Grappa, 9.7km; Edge showed 30km. HR and Power graphics the same on both platforms. I was so surprised that there is no mention on TrainerDay about this aspect :astonished:what is …