Global Positioning System(GPS) is Global navigation satellite system(GNSS) developed by United States Department of Defence and managed by United States Air Force 50th Space wing.
GPS is used in navigation world wide.
It is used for map making ,land surveying,commerce,scientific uses.
For hobbies such as Geocaching GPS is used.
In order for GPS to work, a network of satellites was placed into orbit around planet Earth, each broadcasting a specific signal, much like a normal radio signal. This signal can be received by a low cost, low technology aerial, even though the signal is very weak.
Rather than carrying an actual radio or television program, the signals that are broadcast by the satellites carry data that is passed from the aerial, decoded and used by to the GPS software.
The information is specific enough that the GPS software can identify the satellite, it’s location in space, and calculate the time that the signal took to travel from the satellite to the GPS receiver.
Using different signals from different satellites, the GPS software is able to calculate the position of the receiver. The principle is very similar to that which is used in orienteering
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