The vast majority of reviewers dismiss ‘Headless’ mode and similar as something for beginners. Certainly it has its place, particularly if one gets confused as to which direction the drone is facing when some distance away. But I believe it also has certain advantages for more advanced fliers. So I just did a quick experiment with my little Fimi A3
I flew it out a short distanceover the field behind my garden at right angles to the fence line. Then set it in ‘headless’ mode. A quick check that it was working correctly then moved to a start point. Rotated the drone so that it was at an angle to the fence line, then flew it parallel to the fence using the direction joystick in the ‘right’ direction. so the drone was flying half sideways but in a perfectly straight line. A tricky thing to do in normal flight - the joystick would have to be at an angle and difficult to fly in exactly the right direction. Short clip attached, reduced in size from the original 1080p to save space. A useful effect… Easily in sight of course for this test - very necessary as you will see 
Cheers,
Peter
