Wrong calculation of actual Pace
But while running, actual pace is showing values higher than 4:30 all the time (sometime even 5:30 without me slowing down), which is of course wrong (average can't be less than the the lowest value).
This I can confirm after exporting the data to MS Excel. One line per second. There are times from about 4:35 to almost 6:00 for each second in that kilometer. But no one under 4:30.
When I calculate the average pace from distance and time for this one kilometer (from data exported), it is 4:27, which is exactly the value shown on MySports and also in the watches for that one kilometer.
Conclusion - actual pace calculated in the watches and displayed during the run (in the bottom left corner) is completely wrong.
This can also be seen in the screenshot (attached) on highlighted kilometer.
What to do with that?
I can upload exported data from watches to confirm my observations.