Multirotor aircraft cannot lock heading

ArduCopter Copter 3.3
1

We recently conducted a flight test for our own Octo-copter, but it could not lock the heading and would continue to deflect counterclockwise when it is in loiter mode. Here is the log file. Please help. thank you!

https://drive.google.com/file/d/1Wf4v1rq7Mcavq9ipkWSL12qAKRFZ9g-4/view?usp=sharing

2

How sure are you that all motors are operating correctly?

Please update to ArduCopter 4.0.7 and setup the system again.

3

if you use pwm for the motors, calibrate the ESCs and make sure all of the motors are straight and there are no trims.