True Altitude?

[majorfailure]

Originally Posted by Soldier_Fortune

The cons: it is an online calculator and therefore it can not be used inflight; the player must pause and minimize the game and then open the calculator.

Look further down in the thread you posted a link to, and there you will find a downloadable version.
I'm gonna test this when I've got time, and if it works then there is potential fun in it, now that i've got the basics of level bombing (and the both of you Soldier_Fortune and KG26_Alpha gave me some hints here why I'm not hitting as good as i wished for -so thanks to the both of you)