Spartacus Wrote:how did you know where they were?

They were in fight with my teammates, so mostly teammates spot them for the rest of our team, you can spot any unit if you aim at it and press Q.  If unit disappears from your view it will only remain on your minimap for a little bit, but not for 3d spotting.
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By the way notice how sniping in BF3 is actually sniping on long range distances, not like COD snipe from one corner of the room to another =)