By Nurachman Memed
Since the government launch its GPS satellites, locating just about anything in the world has become considerably easier. From finding stolen cars and locating lost pets to keep airplane and cruises ships on track, GPS has made the world of navigation simple. And while the signal emanating from the satellites is free, what is done with that signal will cost, depending on that it is the user hopes to accomplish.
Initially established to help the government locate numerous types of assets around the globe, GPS is now used in locator services as well as navigational services available in many private vehicles. Using this service costs the end user, but the ability to locate a stolen vehicle and even find missing persons by using their GPS-enabled cell phones provides many valuable services to the population.
A handheld GPS unit can help people figure out exactly where on the planet they are located. Using this information can help them find their way to another known location, which is essentially how navigation services work. Although getting turn-by-turn directions from one place to another is a service provided by a non-government company, using the signals sent from the 36 working satellites equally spaced around the globe.
More Satellite Signals Offer Better Location Services
When personal GPS units became available, there were only about 24 working satellites sending signals from orbit. Depending on the location on the planet, most devices could only receive about four or six signals, given the satellite's given location and the need for line-of-sight reception of its signal.
As the number of satellites increased, so did the number of available signals and today it is not unusual to have a personal GPS device able to receive signals from up to 18 or 20 different satellites. The more satellite signals a unit picks up, the more accurately an exact location can be configured. For example, receiving four signals can offer a spot withing a few hundred yards of the person's location. With a GPS unit receiving 20 signals, the location can be pinpointed to within a few inches.
The most common uses for GPS navigation is on aircraft as they find themselves engulfed in clouds or fog and relying on radar to fins them can be questionable. With the use of GPS systems, their exact position in the sky can be pinpointed, enabling traffic controllers as well as other aircraft to avoid a mid-air collision, providing for the public welfare and safety.
About Author
GPS is a new technology available for everyone in this world. If you want to read more article about GPS Navigation System, please feel free to visit website http://gpslite.info/
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