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gps

GPS Explained

What is GPS? ...
The Global Positioning System (GPS) is a satellite-based navigation system made up of a network satellites placed in orbit. GPS was originally designed for the military, but the system is now available for civilian use. GPS works in any weather conditions, anywhere in the world, 24 hours a day. It is FREE to set up and use.
 
How GPS Works.
GPS satellites circle the earth twice a day in a very precise orbit and transmit signal information back to earth. GPS receivers take this information and use triangulation to calculate the user's exact 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. Now, with distance measurements from a few more satellites, the receiver can determine the user's position and display it on the unit's electronic map.
A GPS receiver must be locked on to the signal of at least three satellites to calculate a 2D position (latitude and longitude) and track movement. With four or more satellites in view, the receiver can determine the user's 3D position (latitude, longitude and altitude). Once the user's position has been determined, the GPS unit can calculate other information, such as speed, bearing, track, trip distance, distance to destination, sunrise and sunset time and more.

 

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