Instructions
Press the "Start" button on your Xbox 360 controller to bring up the game's "Pause" menu. The "Pause" menu includes a radar screen that marks your current location over top of a diagram of the entire level.
Press the "Right" directional button on the controller to bring up your thermal vision. This will allow you to see where you are in relation to your enemies using thermal vision goggles. These goggles read the head signatures of your enemies, making them easier to see in smoky rooms.
Press the "Left" directional button on the controller to bring up your night vision. This allows you to see your location and the location of your enemies in rooms that are dark or pitch black.