Today, I started the car in a long steep uphill, and LapTimer re-calibrated when starting the car. The calibration was seriously wrong, as I saw when driving on a flat surface: the Accel View showed me under constant hard braking!
I soon reset the calibration to fix the issue, but I was wondering the LapTimer would have automatically detected (probably using GPS data), that the calibration was wrong?
So my advice: do a proper calibration before starting any driving where you want precise acceleration data. I also detected that the cruise control of the car was very handy for the step 3 of the calibration where you have to drive at constant speed.
Note: I am a real newbie to Laptimer, so pardon my silly questions.
Calibration: not always working
Re: Calibration: not always working
Not silly at all 
In step #2 (Pitch Calibration) LapTimer simply assumes you are on flat ground. In case this is not the case you get the effect named and need to reset calibration. In a lot of cases this works well and keeps operation simple (compared to manual calibration). One could consider a constant monitoring of acceleration and GPS plot to understand bad calibration - that's the next evolution of automatic calibration...
- Harry
In step #2 (Pitch Calibration) LapTimer simply assumes you are on flat ground. In case this is not the case you get the effect named and need to reset calibration. In a lot of cases this works well and keeps operation simple (compared to manual calibration). One could consider a constant monitoring of acceleration and GPS plot to understand bad calibration - that's the next evolution of automatic calibration...
- Harry
