One more question: I thought the LED lights on the Spark, below the propellers, would also act as a way to check if the drone is facing forward or rearward, when we don't want or can't rely on the video feed for orientation.

The problem is that, while flying, there are only two green lights on the front flashing, so I think they can't be used for orientation. What do you think?

Cheers

I always use it to distinguish the orientation of the drone when the drone is a little far from me and still in my sight.