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How Does GPS Work ?

GPS TRACKER  stands for (GLOBAL POSITIONING SYSTEM ) - 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.
Originally created by the United States Department of Defense as a military application in the 1980s, GPS has since become a multi-billion dollar industry with a wide array of consumer products, services, and Internet-based utilities.
There has 24 (NAVSTAR) Satellites Orbiting the earth produce by the US Government One GPS Tracker requires Three Satellites. The more Satellites above in a Horizon the more accurate your GPS unit can determine where you Are.

Triangulation is the process of determining the location of a point by measuring angles to it from known points at either end of a fixed baseline, rather than measuring distances to the point directly.
GPS receivers take this information and use triangulation to calculate the user's approximate location. Essentially, the GPS receiver compares the time a signal was transmitted by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is. With distance measurements from a few more satellites
These GPS receivers not only track the exact location but can also compute velocity and time. The positions can even be computed in three-dimensional views with the help of four GPS satellite signals. The Space Segment of the Global Positioning System consists of 24 Earth-orbiting GPS satellites.

(Travel of satellites is about 0.06 Seconds)
Longtitude  Measures Distance From West to East
Latitude Measures Distance From North to South.