i do the same thing when i'm trying to take that flag with the apc. Tells me where the guys are and what walls i should shoot. Very helfpul when going up hills and seeing if there's mines on the other side or at the top.
Where have I been, I've hit F10 so many times while I'm on foot hoping it would give me another view, it didin't matter how many times I hit it repeatedly it still didn't work.....I kept trying though...DOH! x2