What happened in the 1970s?
š” Communication Breakthroughs: Launch of the first satellite of the GPS system (1970)
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Further Reading
Brief History of GPS | The Aerospace Corporation (aerospace.org)
GPS - NASA (nasa.gov)
Space - Satellite Communication in the 70's - Scholarly Commons (erau.edu)
Transit Satellite: Space-based Navigation - Darpa (darpa.mil)
Navstar 1, the world's first operational GPS satellite, launches (history.com)
Initiation and early development of a worldwide satellite ... (aerosociety.com)
A Beneficial and Striking Success: Diplomatic Spacepower and ... (spaceforcejournal.org)
Global Positioning System - Wikipedia (wikipedia.org)
Global Positioning System History - NASA (nasa.gov)
History of Satellite Communications | SpringerLink (springer.com)