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GPS – Global Positioning System

When a group of satellites in earth’s orbit transmit defined signals, one can say that the Global Positioning System (GPS) is a technical wonder that these satellites created and allowed GPS receivers to display and calculate accurate speed, location and time information to its user.

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In order to pinpoint your location the GPS receivers captures signals from three or more satellites (among a group of 31 satellites available), and uses a mathematical principal called ‘Trilateration’.

The GPS receivers can store data in its memory such as points of interest, road maps, topographic information and much more, and also has the ability of computing, which allows it to convert speed, location and time information into a valuable display format.


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United States Department of Defense (DOD) originally created GPS as a military application and since early 1980s it has been active. However, in the late 1990s it became useful to the civilians. With a wide varieties of services, products and Internet based utilities it has become a multi-billion dollar industry.

Whether it’s a day or night, raining or snowing GPS works perfectly in all types of weather conditions, around the globe and around the clock. You don’t need subscribe for the use of GPS signals. Some location may cause inaccurate GPS navigation such as skyscrapers, dense forest or indoor spaces.

Generally GPS receivers are accurate within 15 meters, and the newer models are accurate within three meters as they use Wide Area Augmentation System (WAAS) signals.

While the U.S. owned and operated GPS is currently the only active system, five other are being developed by and by.

Currently the only active system is owned and operated by U.S, nevertheless there are five satellite-based global navigation systems being developed by multi-nation consortiums and by individual nations.

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