Polar data

[Harryn]

I have a Polar S725x. I upload my workout data to Polar ProTrainer 5, and to www.polarpersonaltrainer.com, through Polar Weblink.

 

I have noticed that that their is a variance in the distances as reported between Pro Trainer on the one hand, and the website (and the watch itself) on the other. For instance, today the watch recorded my ride distance as being 28,4km, which is consistent with what has been uploaded to the website. However, Pro Trainer list the distance for the same mtn bike ride as being only 27.8km.

 

The funny thing is that on the road bike workouts, Pro Trainer slightly overstates the distance. What confuses me is that the data which is being upload to both platforms is from the same source - so I just cannot understand why there is there any variance at all.

 

Has anyone experienced the same thing - or does anyone know of what could be causing this?

[Wannabe]

Also have the S725X, and also noticed a difference between between the info (distance, max HR) between the info displayed on the phone, and the downloaded info.

Interested what the reason is.