Originally Posted by AluminumDrvr
... for example, make the same dot and then manoeuver the plane so the dot is right over what you want to hit, and the plane will hit it, and very accurately."
Well in theory that's right. If you keep manovering so that the target is allways on the same bearing you will hit it. You might not take the shortest path to point of impact and there are lots of if's and buts but the principle is sound.
There is a well known trick that sailors use... Lets say you are sailing along and see another boat in the distance going at a different speed that may cross your path. Will you collide? To find out you take a compas bearing on the other boat and sail on for awhile. Take another bearing and if it's the same as the first you probably will collide. Works in 3D just as easily.