range/distance indicator (backstab)

[Nemesis7884]

So i want to try out to turn Maia into an elite sniper ghost warrior - basically sneaking up to targets and shooting them in the back with pistols.... the skill says you need to be 2m or closer to the target.

 

Is there a way to turn on a distance indicator or any other indicator that tells me how close i am?

 

Or do all these kind of awareness circles around npc's when you are sneaking all have the same distance (looks like 5m maybe?)?