Earlier this week someone was talking about using the vertical targeting option. I didn't exactly understand it's use until I found these posts. Hopefully they are clear. If you've ever sighted in a rifle, it will be easy to understand. http://forum.warthunder.com/index.php?/topic/170385-does-vertical-targeting-really-work/?p=3205364 http://warthunder.wikia.com/wiki/Gun_Convergence Sorry, I don't have a long explaination for this, but the attached articles and pics are pretty good.