don't know if this might help but I did it anyway and at the moment it seems good I re calibrated the imu plus the gps and also done the controller joystick I tested it and all seems good even though I was not prompted but looking back I did do a gps calibration in my garden and looking back I have a lot of metal in the garden ie gazebo kids swings slides and trampoline so poss a error on my behalf at the time. even though it said it was a good calibration at the time hope this might help there is a lot of experienced people on here who might be more helpful.