Navigating system GPS is the most popular American navigating system.
Created in the last century, navigating system GPS has passed some stages of the evolution, beginning from purely military application, professional use on transport and finishing extremely wide use presently.
System GPS is created in the USA and maintained on money of the American budget, but simple users all over the world can use it absolutely free of charge.
Despite existence of set of alternative projects, such as Russian GLONASS, European GALILEO or Chinese BEIDOU, all of them aren't competitors. Undoubtedly, using an advanced experience of developers GPS, its followers at start of the systems in operation can't take a payment for the services as yet soon can be compared with GPS on quality of work and accuracy of positioning.
At the same time, sharing of several navigating systems for the decision of a navigating problem allows to raise considerably accuracy, and the main thing sharply to reduce time intervals when the decision in general can't be received.
The general things about system GPS:
1. GPS won't forbid after full expansion GLONASS as manufacturers still for a long time can't make household tiny receiver GLONASS of the same sizes with the same consumption. And professional navigating receivers (for example, geodetic) become for a long time already combined as many problems essentially can't be solved at work in one system.
2. GPS works free of charge and will work free of charge.
3. GPS gives very good accuracy of positioning and will raise it with input of new signals for civil users and new generation of companions.
4. GPS it is built in in large quantities communicators and cellular telephones and the majority of cellular telephones is fast will be equipped GPS.
Even if very much it would be desirable it, progress not to stop. It is impossible strong-willed decision to forbid phone, telegraph, the Internet and GPS.