In which decade was the very first prototype satellite for the modern GPS system launched into space?
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The first experimental Block I GPS satellite was launched in February 1978. It took another fifteen years and dozens of launches before the system achieved full operational capability in 1995. Today, the system is continuously updated with newer generations of satellites to maintain accuracy. Photo: Paulsava, Wikimedia Commons, CC BY-SA 4.0.
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Source: Wikipedia (CC BY-SA)
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