Verid... that's because .. if you scroll up this thread, you can see that Thomb posted:
im using the new 58.20 fw with picloc 3x pro v1 but my horizon keeps turning 25 degrees everytime. what can this be?
I reached him by email and asked him whether his Accelerometer Correction -> in the Calibration Tab, was perhaps Zero, or empty.
And it was
Empty. ( my fault !! )
This means that there was no accelerometer keeping the IMU in co-ordination with Earth reference ( in scientific terms.. called 'Converged' )
Therefore, the horizon started going off slowly.... and most probably... that shot was about 3-5 minutes into the flight after a couple of turns wherever.
gm>>