The term GPS is refers to the Global Positioning System. It is a course-plotting or map- reading system which is based on satellite. The GPS system made up of a network of 24 satellites located into orbit by the U.S. Defense Department. GPS was at first featured for military purposes, but in the year of 1980s, the US government made the system obtainable for civilian use. GPS works in any climate conditions, anywhere in the world and for 24 hours a day.