K = Compass
I don't know of any missions where you are left without a compass, but there was one mission in
OFP where you had to navigate using the stars (or if you're really cheap steal the helicopter at the enemy base)
This is a neat little program. I'd be no good at this sort of thing though =P
EDIT: Two more things. It would probably be better to go into the game after doing this 'quiz' since you have a whole dome of sky you have to search for Polaris.
Two, I always found it cool in
ArmA to go to the highest mountain with a radio set up to skip time 24 hours, then do that rapidly while watching all the stars rotate around Polaris =)
More edits: Question 33 made me chuckle, since you can see the status menu vaguely on the left hand side. Also, apparently I got a 100% =) However, it would be much more difficult to actually do it in the game, as I said.