Do I need to fly figure-eights before and after scanning?

Do I need to fly figure-eights before and after scanning?

Yes, ALWAYS fly figure-eights before scanning. Flying figure-eights minimizes the covariance values (uncertainty position/attitude) and allows the navigation system to better estimate the current IMU drift and noise. If you intend to post-process the trajectory for increased accuracy, you must fly another set of figure eights after the scan is complete.