Using EK3_SRC1_YAW to 3 requires that you have 2 GNSS receivers. Do you have that?
I suggest you update to ArduCopter 4.4.4 and follow Methodically tune (almost) any multicopter using ArduCopter 4.4.x without skipping any step.
Using EK3_SRC1_YAW to 3 requires that you have 2 GNSS receivers. Do you have that?
I suggest you update to ArduCopter 4.4.4 and follow Methodically tune (almost) any multicopter using ArduCopter 4.4.x without skipping any step.