In this video tutorial, we go over all the steps on how to calibrate the IMU on your DJI Spark. Unlike the compass, the IMU does not need to be calibrated as frequently. You should calibrate the Spark’s IMU when you first receive your drone. It has come a long way and most likely has been banged around a bit so it’s a good Idea to calibrate before your fly for the first time. It’s also a good idea to calibrate the IMU after a crash. In addition, if you notice your aircraft not behaving like it should, drifting when hovering or veering off to the side when flying a straight line, an IMU calibration should clear that right up.

DJI Spark (Amazon) http://amzn.to/2vLwHqi
DJI Spark (DJI Website) https://goo.gl/DvoqK1