They had a firefight going on and only 1 survived. He died out of circle. Which all 3 of us were already in. We were waiting for someone to crest the hill in front of us so we could light them up but we didn't have to fire a shot.
Apparently it tracks your movement and the circle, will tell you how long it will take to run to the circle from where you are and shows loot probability.
Found it via Aculite on Youtube and he says it is not a bannable addon.