Find your way with the Global Positionning System
The Global Positioning System, usually called with his acronym: GPS is the more common global localisation system, it was initially design for the US army.
This device provides the exact position of people on the surface of the earth.
It gives informations anywhere on the sea on land or in the air. This tool GPS use the WGS84 geodesic system, witch is a model that simplificate the shape of our planet