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GPS is basically a global positioning system used to locate a GPS receiver, which will receive in three-dimensional space anywhere you might be on earth. GPS is controlled by 21 active orbiting satellites at almost 12000 miles above the Earth. The GPS navigation system is designed to have multiple tracking satellites at any given point on Earth. Ground control stations and spare satellites complete the full global tracking system. GPS navigation is probably one of the most astounding inventions to help mankind in so many different applications. An example of GPS you might not have thought of is parcel-tracking delivery by truck, ocean liner guidance systems; airlines right down to hikers to golf cart GPS. The reason GPS navigation is so widely used is because of the very rapid and high degree of accuracy, which can be used in all weather conditions and any time you need it no matter where you are on earth. With the use of transmitted radio signals from satellites your GPS receiver has the ability to find your position within 50 feet (15 m). GPS software is used to take the information and evaluate the position of the GPS receiver. There is a very basic principle that is used from the gps receivers that is it reads signals from multiple satellites and places at least three positions on the ground taking a barring and draw a line through three points then you'll know exactly where you are globally positioned. There are a few limitations that may hinder your calculations. First the GPS navigation receiver should have a clear view to the sky in order to receive data. Radio microwave signals travel in straight lines just the same way light waves do. You will find anything solid will block your signal such as a canyon wall or even trees. Any weather conditions like snow or rain will not interfere with a satellite signal. There are several different uses that you could use a GPS unit. On the road in a car, hiking the wilderness out in the water or even in the air. All of these areas can be sub categorized to more specific uses depending on your specific GPS needs. Looking for a vehicle tracking GPS realize that these units need to have some reasonable accuracy and be reliable. They must contain road maps detailing areas that you want. Remember the satellite is only used for transmitting and timing of global positioning informational data and don't send actual area maps data, that is up to your GPS navigation unit to calculate. There are portable GPS devices that you can quickly install in the vehicle for the same use. You can always acquire a handheld GPS unit and be portable and on the move anywhere you need to be. One more is the Marine GPS, which uses very specific GPS mapping software programs because it needs to use information differently it also should be water resistant to protect itself.
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