Gun Convergence

[28_Condor]

Hi!

I'm a little confused about what value to put in the game: meters or yards?

I ask because we need to put the the range to taget (convergence) in order to hit your target:

http://jimeez.weebly.com/setting-the-gunsight.html

If the convergence is in meters then first need to convert this measure in yards.

Another question: is still necessary to put in double the convergence on gunsight?