When you are moving in the M4 the rocket flight path does not seem to be intuitive. I understand that their flight would be off somewhat because of relative motion, but the result I get does not meet with intuition. The offset does not seem to be proportionally correct to me.
https://youtu.be/nOE46JCFjLM
The direction is correct, but they instantly weather vain to their direction instead of wobbling.
Shoot bullets out the side of a b17 you will see the same effect. If your aiming to the right side of the vehicle/plane the projectile will hit to the left of your aim point.
HiTech