The DJI Phantom 3 Professional is the best drone on the market today in my opinion. With that said, it does have some minor kinks that the user must know how to troubleshoot and resolve. As the result of recent DJI Phantom 3 firmware updates, my Phantom 3 camera became crooked (it filmed and the horizon wasn’t straight). Also, I received weird “bias” errors, “IMU” errors, etc. upon powering on the Phantom 3. Within this tutorial, I explain how to calibrate the Phantom 3 IMU. This resolved my issues and I hope that it helps you too! Please share with others!