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In the 1960's, the US Military used a satellite-based positioning system called "Transit" or NAVSAT. Originally developed for the ballistic missile program, the system consisted of five to ten satellites (five operational and five back-up) in polar orbits at an average altitude of 600 nautical miles (690 mi. or 1100 km).

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The first satellite navigation system was developed in the 1960s by the United States. The Transit system, which used a constellation of satellites to provide navigation, was the precursor to the modern GPS technology. It was primarily used for military purposes initially.

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9mo ago
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Q: When was the first satellite navigation invented?
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