I closed the GPS and open SONAR. Set CH7 switch AutoTune.
First, Stabilize mode and height 10 meters remain, Then, Change the flight mode to ALT HOLD
I open AutoTune, any did not happen.
I closed AutoTune, Plane began "dancing" and I got a new PID at three minutes later.
I imagine this 3DR Y6, as filming a documentary on my Amazon aerial plan.
I do not use universal joints, only the damping to obtain subjective images.
FPV flight , and use Stabilize and AltHold mode, in the range of 3 km.
Use PX4FLOW maintain a high level of 3-5 meters ,
3 MB1240 attached to the front , left and right to avoid obstacles.