Before knowing about the auto navigation system, there are a few basic things to know and understand about the Global Positioning System (GPS). The GPS is a satellite is a group of 24 satellite placed into the orbit by the US Defense department. In the past this technology was strictly reserved for military use and was not used by civilians until the 1980s.This GPS works in any weather condition and can be used any where in the world. It works 24hours a day and is completely free for any one who wants to use the GPS.