Hi Sid, ran this one by a TM. It was explained to me that the guidance is X-Y. The (MK-48) will change depth in a vertical way and course in a horizontal way. Keep in mind I am only a knuckle dragging Machinist Mate, so I tried my best to explain to him what you are asking, but this is all I was able to get out of the fellow. from his experiences he did not think that there was any other dimensional or spatial ability in how a 48 gets from point A to B. I am surprized that there are not any TM's on this site. I know there are a few of us bubbleheads here. But then again, I am not sure if it is classified material. But if you ever have a question about submarine hydraulic systems, boy I can chat ya up on that one. (yeah right!)