Found UAV, what is the purpose?

Found a UAV in game, but it looks to be too high to reach (having off edge of a building). What is the purpose of the UAV? It is marked on the map, but nothing is around to interact with.


What is the purpose of the UAV?

Found it, when you encounter the UAV you can cross hair over it and they turn red indicating an enemy. When enough damage is done to the UAV it drops what looks like a recorder. Picking it up rewarded +300XP.