GPS

The GPS (global positioning system) is a global navigation system that uses satellites in space around Earth that can calculate position and weather anywhere on the planet reliably, so long as at least four satellites have an unobstructed view to a receiver. It is maintained by the United States Government, but is freely accessible to anyone in the world.

Battlefield 2: Modern Combat
In Battlefield 2: Modern Combat, the Sniper Kit has a GPS receiver that can locate nearby enemies, similar to the Motion Sensor from the Bad Company series.