I'm guessing a lot of the flight sim guys will have seen this sort of stuff before, but i've never really seen a good demonstration of it's use until now.
http://www.youtube.com/watch?v=9wXx3vMy_AQ&fmt=22
Apart from the tracking system looking cool ArmA 2 itself is looking very slick!
http://www.youtube.com/watch?v=9wXx3vMy_AQ&fmt=22
Apart from the tracking system looking cool ArmA 2 itself is looking very slick!