What is Global Positioning System (GPS)

Is the space based satellite navigation system that determines the location and time
information about the person you want to know his place, anywhere and anytime 
whatever the weather is, mainly it provides critical information for military,civil and also commercial users. In fact this is a satellite system that is supported and maintained by the United States government and is freely accessible by anyone using a GPS Receiver. Besides, you can use it to know the place for people (spouse,boyfriend,children) that you care for and love to keep watch and know their places.