Distance Indicators?

[sigintwarrior]

Howdy all,
While new to these forums, I have been playing the IL2 series for some time now and just started playing CoD. My primary question is in regards to the distance indicators. Admitedly, I fly with Icons enabled so that I can find/keep track of goodguys and badguys. I am refering to the arrows that point towards the planes. I am a bit confused about the distance indicators. The numbers that appear next to the target a/c. I.E. 2.0, 1.6, .5 and so on as you get closer. Are these numbers in yards or meters? I.E. 2.0=200 yards, .50=50 yards? I usually wait till I am .50 before I open fire and find that my rounds do not converge. I appreciate any info you could provide me on this. Trust me, this is only the first of MANY questions... lol.