@egika From an individual training point-of-view, 400 vs 410m is no issue. However, if you train in group, it’s rather nice that your watch registers the track length correctly. It’s not your watch who’ll determine how much you’ll need to run, but the track itself… But then the suunto does measure the intervals correctly.
I understand the frustrations of the people who train on track. I sometimes have them myself as well, but luckily I also have some nice trails in the neighbourhood. 😉