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Today NAVSTAR GPS (Global Positioning System) is a well known fact that has already become a standard of life for a great number of people. The purpose of the arrangement is the defining of the velocity and situation of the objects. It may define the object at any area on Earth, even in polar areas and in space to one hundred kilometers above Earth in any weather conditions. The United States Department of Defense has developed and accomplished NAVSTAR GPS.

The situation is identified by the principle of measuring the distance from the point with the fixed coordinates to an object. The sending satellite spreads radio signal to a GPS antenna and the delay time is calculated to detect the distance between the receiver and transmitter. It signifies that to define 3-D coordinates GPS receiver must identify the distance to 3 satellites and the time of the GPS system. And when we want to define coordinates and altitude of a receiver we have to use minimum 4 signals from 4 satellites. Orbital force supervision is implemented from the principal control station that is situated in Schriever base, Colorado.

GPS receivers are frequently used today by civil people, sailors, rescuers and the police for position and velocity definition of diverse objects. You may buy GPS systems in various stores. Nowadays it is often built in mobile phones, personal computers and onboarders. GPS receiver allows a consumer to detect geographical coordinates of the receiver's situation at the present moment. The exactness of the situation detection is from 3 to 5 meters and when the signal is improved from Earth it becomes higher and can be to one millimeter.

Also a lot of internet sources suggest GPS mapping software to get. Such system gives you a possibility to detect your geographical location on the electronic navigation map.

There are 2 kinds of electronic maps. Raster maps are related to the first kind of maps that are the simplest and the most open. This type of electronic maps is a simple image of the territory where the coordinates of a receiver are used. There are used various scales but it mostly depends on the initial variant of an electronic map. It may be both a photo from satellite and scanned paper map.

And vector electronic maps are made with their proper database inside that makes them very helpful. There are all facts about surrounding objects, the place you are located in and other helpful data for a traveler. For example the area information consists of the rivers, lakes, mountains and other objects that are situated in this territory. And of course, both raster and vector Global Positioning System maps would inform you about the motels, cafes and restaurants, filling stations around. So you may buy also portable automotive that will give you a comfort on the travel.

There are also some drawbacks that Global Positioning System has. The basic shortcoming of all radio-navigation arrangements is that radio signal may not come to the receiver owing to some conditions. A user will be practically invisible for GPS signal in reinforced concrete constructions. None the less it remains to be the greatest way of the location defining for the present moment of time.