Global positioning system

Satellite positioning system is a kind of using satellites for accurate positioning technology, something it from the initial position precision is low, cannot real-time positioning, and provides timely and navigation services, development to today's high precision GPS global positioning system (GPS), realized at any time, from any point on earth 4 satellites can be observed at the same time,  In order to achieve navigation, positioning, timing and other functions.  

Satellite positioning can be used to guide aircraft, ships, vehicles, and individuals to safely and accurately follow selected routes and arrive at their destinations on time.  Satellite positioning can also be used in mobile phone tracking and other functions.