GPS stands for Global Positioning System. It is a satellite-based 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 GPS system is made up of three segments:
The space segment consists of 24 operational satellites and 3 spares that orbit the Earth at an altitude of 20,200 kilometers (12,552 miles). The satellites are arranged in six orbital planes, with four satellites in each plane.
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Anywhere on or close to the Earth where there is an unhindered line of sight to four or more GPS satellites, the Global Positioning System (GPS) can be used to determine one's location and time in any weather. The system offers vital capabilities to users in the military, civil, and commercial sectors worldwide. Anyone with a GPS receiver can freely access it because it is maintained by the US government.