Motion sensor

The motion sensor is a usable item in Fallout and Fallout 2.

Background
The Wattz Electronics C-U model motion sensor is a computer auxiliary that detects the movement of biological material over a distance of meters using a tuned radar device. The motion sensor can be used in conjunction with the Pip-Boy 2000 AutoMap feature, and will display all living and moving beings on the map - represented as red dots. The C-U model is only compatible to the Pip-Boy 2000 or earlier models; the PIP-Boys used by Vault City personnel are too advanced to use this auxiliary.

Gameplay
When used - either from the active item slot or from inventory - the motion sensor will automatically call up the automap and display all entities on the map (or critters, in technical terms used by the engine) as red dots on the map.

In Fallout 2, having a motion sensor in inventory provides a +20% bonus to the Outdoorsman skill when traveling on the world map. The +20% bonus is applied to the party member with the highest Outdoorsman skill. A motion sensor does nothing in the inventory of a companion.

Fallout

 * Junktown: Sold by Killian Darkwater.
 * The Cathedral: Sold by shopkeeper.
 * The Hub: Sold by Mitch at the general store.
 * Unusual Call Box special encounter: Found after the TARDIS teleports away.
 * The Glow (Level 1, northeast): In one of the lockers.

Fallout 2

 * Vault City: Quest reward for completing Enter NCR and return to Stark.
 * Navarro: Carried by the quartermaster, who must be killed for it.
 * San Francisco: Jenna at the Oil Tanker's general store.

Behind the scenes

 * A motion detector exists in the game files for Fallout Tactics, but is not used in the game.
 * A motion sensor was planned for inclusion in the canceled Fallout: Brotherhood of Steel 2.