Enhanced Sensors

Enhanced Sensors is a perk in Fallout: New Vegas given to you while you have ED-E or its copy as a companion.

Description
This perk greatly extends the player's detection radius, even with extremely low Perception. Any target, hostile or friendly, will appear on the compass well before they can actually see you in return. It also allows you to target cloaked enemies in V.A.T.S. mode. When paired with the Spotter perk given by Craig Boone, the player can effectively snipe targets from much greater distances.