This is how to perform the DJI Phantom 3 IMU Calibration within the DJI Go App. Many people were unable to find the “calibrate IMU” option within the DJI GO App but there is where to find it. I calibrate my DJI Phantom 3’s IMU after every firmware update. From my experience, performing a Phantom 3 IMU calibration helps to better optimize flight stability, as well as camera performance. If you’ve ever encountered a “tilted horizon” issue with the Phantom 3’s camera, then there is a good possibility that performing a Phantom 3 IMU calibration may resolve that issue.
DJI Phantom 3 IMU Calibration HOW-TO