Hook to PC ASSISTANT,
Check your IMU readings:
Gyroscope
Accelerometer
Compass
Let us know your MOD VALUES?
IMU= Inertial Measurement Unit
( takes readings from ( gyroscope, accelerometer, & compass )
It takes the values and creates a MOD VALUE for each.
MOD= MODUUS
( another term for absolute value )
Basically goes like this:
Gyroscope SHOULD BE : ( 0.0 - 1.5 )
Accelerometer SHOULD BE : ( .98 - 1.02 )
Compass SHOULD BE : ( 750 - 2250 )
If any numbers above are OFF, perform a ADVANCED IMU CALIBRATION.
Also run a Tx ( controller ) calibration while you are still in PC ASSISTANT.
Do a FRESH COMPASS CALIBRATION before first flight! All should be well.
If for some reason your compass IS WAY WAY OFF ( like in the negative numbers )
You'll need to do a compass RESET .
How to reset compass below:
http://youtu.be/kCT1rRE_UIg
Take care, Fly safe!