GPS & Satellite navigation system...the wide world is in your hands!!

GPS :-
The Global Positioning System (GPS) is a space-based satellite navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. The system provides critical capabilities to military, civil and commercial users around the world. It is maintained by the United States government and is freely accessible to anyone with a GPS receiver. Using a GPS receiver  you can get your precise location very easily as the location will be specified by the orbiting satellites.
The GPS receiver has become a common item that is fitted to many devices, such as your mobile phone or the security system in your car. Many smartphones, such as the iPhone, have a GPS built-in. If allowed, applications can use this information to direct you to, say, the nearest Italian restaurant. Some digital cameras even have a GPS. They can use it record exactly where the photo was taken.


Satellite navigation system :- 

A satellite navigation or sat nav system is a system of satellites that provide autonomous geo-spatial positioning with global coverage. It allows small electronic receivers to determine their location to within a few metres using time signals transmitted along a line-of-sight by radio from satellites. Receivers calculate the precise time as well as position, which can be used as a reference for scientific experiments.A sat nav is really some very special software that uses the GPS signal. It takes the co-ordinates provided by the GPS and combines that with a comprehensive map. Then, given a destination, the sat nav software will calculate a route for you to your destination. As the GPS signal is constantly updated, the sat nav can give you step-by-step instructions on where you are and when you need to make a turn.