Esc calibration-- compass motor calibration gives error

ArduCopter Copter 4.3
1

esc calibration-- compass motor calibration gives error, latest 4.1.5 works fine when i install old versions. Help?. I’m using Cuav Nora

2

You really want to use Magfit to generate the compass motor coefficients. Also for the Compass offsets (both at the same time actually). It’s easily done using MAVExplorer:
Magfit
Don’t be intimidated by the the fact it’s a Python utility. MAVExplorer makes this mostly transparent.

3

Why can’t we calibrate the compass motor in the new version? I can’t calibrate PWM Range esc in new version. How can we come up with a solution?

4

You can but it’s inferior, and a general hassle, compared to using Magfit.