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GPS is a US Military Asset, 100% owned and operated by the US Military. They allow civilian use of a part of the GPS system during peacetime

If another World War breaks out, or major conflict that the military deemed necessary they can and will cut off all Cilivian access to the GPS Network

This is why Russia has its own, and China is in the process of Deploying its own, and the EU has considered deploying their own as well.

EU is also in the process of deploying its own: Galileo.

And there are chipsets now capable of simultaneously using GPS, Galileo, and BeiDou (Chinese system) for greater accuracy. Any ability of the US government or military to "cut off" GPS has been nullified.

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