When you talk about GPS, it mostly is about the GPS receiver. It is a system of navigation that relies on the 24 satellites that orbit on the Earth. There are 3 more satellites if one of the 24 satellites is failed. The satellites run the Earth more less 12.000 miles above Earth surface and shape 2 perfect orbits in every 24 hours. GPS then transmits radio digital signals and data on the location of the satellite and the precise time to the receiver that is on the Earth. The signals are transmitted in the speed of light. The longer the time to reach the receiver, the farther the distance of the satellite is. If GPS uses three satellites, it will get the information of longitude and latitude, based on the location of the three satellites intersects. If GPS uses four satellites, it will also calculate the altitude.
The GPS is now available in the simpler shape. It is now completed on the smart phones, cars, and watches. For the common people, it is used as the tool to navigate them to find the location. And for the businessman, it can be used as the fastest way to find the location, forestry, cartography, find the management of wildlife habitat, the potential spot of mineral exploration, monitors the people movement, and show the exact time on the Earth. It sure will help them a lot.