Hi, today I has done about 60 laps in karting.
So the first run (25 laps) it had a extreme good precised times, compared to Alfano (profesional chronometer) the fail is 0.05s +/-. In the Alfano my better lap was 1.10.88 and in racechrono 1.10.89. And had a very good data login from GPS.
The problem was in the second and third run, it recorded very bad, the precision was 0.5s - 1.0s I has done with 5Hz every time, so if I see the race line in the map the first run was very exact, but 2nd and 3rd very very bad. What can be the problem? The phone always I have in the pocket and the GPS don't move. The sky was clear all day