What are the four global positioning systems?

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China's Beidou satellite navigation system and the United States, GPS, Russia's Glonass, the European Galileo (Galileo) and known as the world's four largest satellite positioning system.

What does GPS mean
Express is how to achieve the positioning of 5?
I would like to install a car on my Fawkes gt06n GPS locator,
GPS locator has a mobile phone card can automatically transmit voice
How to pay for the satellite locator on the car, how much to pay?

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What are the four global positioning systems?

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