I was playing an online multiplayer, and I noticed my player didn't have a map. But when i approached my team leader, a hint told me i could view their map as long as i remained within 5m of them. Additionally, there was no marker on the map for my player - I had to use the terrian landmarks to find myself.
I liked it - cool!
So I've worked out that the lack of a player marker on the map is a feature of the more difficult player setting (Expert or Vetran I think), but I haven't been able to replicate the viewing another soldier's map feature.
a) How is the "view another soldier's map, based on proximity" achieved? Is that a scripted feature?
b) Is there a wiki page listing the effects of different difficulty levels? I couldn't find one.