iSport shows in the beginning weird tilt

[muenchenchris]

hello,
I recognized in the beginning of my trainings sometimes very hight watts. Up to 2000 sometimes.
The reason for this is always very high tilt. The area was flat at the beginning and it showed 20 percent and above.

However I have checked the tilt in the beginning while standing. The tilt was very much ok while standing.
Then I started the cycling and immediately the value around zero went up to 20 and above. Then I stopped again and the value was again around zero. This I reproduced a few times. So it made no sense to do a new tilt calibration, because while standing it was really ok.

The only thing I can say. Both of those trainings were not done at home. They were ca. 200 to 400 meters higher over the ocean level.
The battery was fresh and I did a calibration ride and cost down the day before.

And now the funny thing: after 5 minutes everything was ok. The tilt went down to normal values and the power was ok, too.

How does this automatical tilt calibration work in the first 5 minutes?
Is this normal, if you go to a higher place?
What do I have to do, if I go by car to a higher place? tilt cal; cal ride; cost down?
I think it is not ok for the whole training with values about 2000 watts in the beginning. It lasts two hours untill the average goes down to 200 watts and this is really to much.

Thanks to all
Christian from Germany

[racerfern]

The weird tilt for the first 5 minutes has nothing to do with the elevation change. The weird power and tilt readings during this time are the result of a poor tilt calibration. It may also be the result of the iBike mount moving or the headtube being loose.

[muenchenchris]

Thank you, Fernando.
OK, next time, when I have the same problem I will stop immediately and will do the tilt calibration.