You could also buy a real E6B (circular slide rule thing) but you would need a chart of GPH for different pwr settings and also some way of knowing how many gallons you had when you started.
By the way its easy to see an offensive tone in what are intended to be innocuous posts, this is the kind of thing that starts warrrr.......oh, right, its a war game anyway.
Imagine if you had to navigate with a map and gyro in this game, I guess the "base under attack" voice could give you vectors to intercept. Wonder how popular that would be?
I think the B-29 should come with a sextant.
Does anybody remember the world before GPS? I do.