Enhanced Sensors

 is a perk in Fallout: New Vegas given to you while you have ED-E as a companion.

With this perk you can detect enemies at a very far range (especially with high perception), and enemies that are cloaked can also be targeted in V.A.T.S. mode. It works extremely well with the Spotter perk given by Craig Boone. This works exceptionally well for sniping in an open area from an elevated position like a hilltop. Line your crosshairs up with the red hashmarks and the previously too-distant enemy will render. Snipe, rinse, repeat.

This perk has no effect in most compact indoor areas (e.g. buildings/caves/vaults). Together with ED-E's poor damage output, ED-E is virtually nothing more than a mule in indoor areas. On the other hand, in outdoor areas filled with dangerous enemies, this perk can be an absolute lifesaver, with the extended range it is possible to identify opponents from well beyond their visual range. In many cases they will be marked before the player is detected even if not sneaking. It is possible to learn to identify some particularly dangerous enemies by their movement patterns (for example a group of 4-6 fast-moving enemies is almost certainly a nest of dangerous Cazadors).