GPS tracking systems are a boon for many, especially people who are poor in sense of direction. Nowadays, latest model in-car navigational tools are the right kind of vehicle companions to keep you on the correct track for long journey travels.

Interestingly, the superior technology that goes into making of a GPS plays key role in the quality assessment of every such device. It is better to have sound background knowledge on the working technology of a GPS system before going out to purchase one.

GPS Mapping & The Technology:

§ In the year 1973, the Defense Department of United States- Military division initially developed the first GPS network.
§ This NAVSTAR GPS device includes thirty space satellites revolving round the earth, once in 12 hours.
§ There are 5 earth-based stations that observe the positions of the satellites in the space and record their operational condition.
§ To verify your location and all other data precisely like the current speed and average mileage, heading directions, and the elevation, GPS device tools uses a kind of receiver to connect to four or five of the satellite signals.
§ This is generally known as 3D fix and that is the major reason GPS antennas essentially need the unobstructed aerial view to perform accurately.
§ Then the GPS receiver overlays all these valuable information to the mapping files that is present in the unit, thus exposing your present location and position on the map and all your vehicular history.
§ The GPS receiver keeps recalculating the current location to the satellite's position.

A good quality GPS tool includes a full twelve channel receiver with an antenna to catch the satellite signals. There is also a CPU to sort out all the data. Your exact geographical position and the receiver's superiority actually determine the time taken by the GPS device to pick up the 3D fix signals. For example, if you are en route through a dense forest area with many trees obstructing the skyline, then the receiver may be unable to catch signal ranges.

It is important that the GPS device antenna has an unobstructed view of the sky for giving best results. When you fire the GPS device for the very first time, it may acquire a blank, but, good receivers instantly pick up the signals and 3D fix. Sometimes you may have to stop the car to able to give the receiver time to catch the vital signals.

The latest portable models of GPS are equipped to set directly on the windshield through a mountable device, thus giving the GPS antenna a complete and clear sky view.

The author is a GPS expert and writes for http://www.gps-software-hub.com - one of the largest and most popular blog on this subject .

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