Thanks for the replies. Wow.
Barry, thanks for the advice. I've programmed in Basic a little myself on the C64, but it's been a long time between drinks.
Hehe, I was being a bit jovial with the plural meaning of "axis", I just thought it sounded well, calling it "Axi".
Bojan and Rod, That link is fantastic. (Mel Bartel's). Now why didn't I just search on Mel.
I just needed to quell my curiosity, just in case I was going to make an idea that was simple, but in practice, got a little too complex for my liking.
Again, the idea, is sort of to do what Nasa does when they film the shuttle going up (how they track the shuttle in the middle of the view). I know how complex that can get, so I'm trying not to aim too high in a build aspect.
I'll have a good read over that link. Great starting point. Thanks.