What satellite helps us locate places on earth?

The Global Positioning System (GPS) is a space-based satellite navigation system that consists of a series of satellites used for locating places anywhere on or near the Earth. GPS became fully operational in 1995.

There are also a number of satellites that take high-resolution imagery of earth including GeoEye-1, QuickBird, WorldView-1, WorldView-2, and others. High-resolution images combined with a precise location can help to locate any place on the planet.