I made a howitzer that needs coordination to accurately fire and hit the target. this. this is the rotation, you can also use this in elevation. Okay, so 0 is the middle or straight and 1 is 10 2 is 20. here's an example (2,3) the 2 acts as the rotation and the 3 is the elevation, from the guide you see the red lines indicates the distance of how much you turn like the given 2, all you need to do is to find the middle(the 0) and count. its simple as this 0 1 2. 2 is the given so stop at 2. now at 3, 3 is the elevation. simply watch your throttle, if you hit a 3% stop there so it would match the given. As simple as that you have a direct hit.