After 3 years of using 4 x Mikrokopter Hexa's for aerial photography, I purchased 3 APM 2.5 boards and attempted to use Ardupilot instead just because the english was so much easier to understand and the telemetry system seems to be much better and…
"Peter I am having exactly the same problem, even when I hold the board exactly level when doing the accelerometer calibration in MP, it shows up on the artificial horizon in Flight data tab as leaning to the right slightly, after the calibration.…"