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The satellites behind GPS are paid for, maintained and upgraded by the US Department of Defense. That means that the system is essentially free, although you may have to pay for a device and software to utilize it. Smartphone apps, such as Google Maps, that use GPS are also typically free.

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GPS has its origins in the Sputnik era when scientists were able to track the satellite with shifts in its radio signal known as the "Doppler Effect." The United States Navy conducted satellite navigation experiments in the mid 1960's to track US submarines carrying nuclear missiles

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GPS designed and maintained by the US Department of Defense, GPS was originally intended for military use only, but since 1980 the US government has allowed it for civilian use.

- The first GPS satellite was launched in 1978.
- Complete 24 satellites in 1994.

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GPS systems are extremely versatile and can be found in almost any industry sector. Today, GPS is used to map forests, help farmers harvest their fields and airplane pilots navigate on the ground or in the air. Positioning systems are integral to military applications and for emergency crews to locate people in need of assistance. GPS technologies are often working in many areas that we do not normally consider.

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GPS is a system of 30+ navigation satellites circling Earth. We know where they are because they constantly send out signals. A GPS receiver in your phone listens for these signals. Once the receiver calculates its distance from four or more GPS satellites, it can figure out where you are.

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The Global Positioning System (GPS) was developed by the Department of Defense

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6. What are the benefits of the invention?

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6. What are the benefits of the invention?

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You won't have to have trouble finding your way anymore, but you can view or Choose to set up the most convenient route to your destination. Now we have GPS for convience in life