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How GPS Works

Reviews, links, and resources about Car Electronics: Car Audio, Car Video, Car GPS and More

Global Positioning System (GPS) is a navigational aid originally developed for the military. The system simply receives signals. It is the applied technology that gives the GPS its versatility.

If you have ever used map and compass, you will understand a little about how the GPS works.

The intersecting line from the reference points is where you are. Map and compass work uses triangulation (bearings), GPS uses trilateration (distances) to calculate location. Satellites orbiting the earth emit unique signals that can be received by a GPS. The GPS software interprets the signal, identifying the satellite that it came from, where it was located, and the time that it took for the signal to reach the system.

Accuracy depends upon the synchronization of atomic clocks in the satellites with the clock in the GPS system.

GPS has gone far beyond its initial military application. Drivers can find their way through city streets, long distance trekkers use the technology to cross unfamiliar terrain, mariners and pilots use GPS enhanced data to cross the seas and skies.

In--vehicle GPS can be integrated into the car entertainment system or can be installed as a removable device.

The information includes road directions plus relevant features along the way such as rest stops, gas stations, points of interest, etc. Auto GPS uses voice commands so that the driver can concentrate on the road.

Mapping software defines the territory that the hiker will encounter.

It is GPS technology that is used to track individuals on home arrest, to trace missing pets, stolen vehicles, and missing people. Small systems can be incorporated into pet collars and wristwatches.

Marine and aviation GPS units are sophisticated and specialized.

Units have been developed for use on float tubes also -- as GPS technology advances, the systems become more and more compact and their uses
more and more extensive.

 

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If you are considering purchasing a GPS, make sure that it can be updated easily. This is especially true if you buy a multi--function GPS or one that is used where conditions change regularly. An in--vehicle GPS soon loses its usefulness if it is not updated as road systems change.

GPS units vary in price according to their usefulness. It is possible to buy units for less than one hundred dollars to units costing more than one thousand dollars.

by Anne_King

Understanding How GPS Works

GPS is very common place today, yet many of us don't even understand how it works.

The term GPS refers to a technology that is also known as Global Positioning System.

The Way GPS Works

All GPS units work using the same technology. GPS units get all of their data from orbiting satellites and information about time and position is transmitted from these satellites to the GPS unit.

Theoretically, GPS systems can work all around the world.

Of course, for the GPS unit to work as accurately as possible the unit must be able to have a direct line of sight to at least three satellites in the sky.

All of the units use the same technology, the more expensive units usually just have more bells and whistles such as more user friendly interfaces and touch screen displays. You can buy a very basic GPS unit that will get you around town and on your short trips without a hitch, but if you need a GPS unit that will help you with complicated routes you may want to go with something more costly.

by Heather_Jacobson

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