The Global Positioning System (GPS) we use today was originally developed by the United States Department of Defense for military purposes.
Development began in the 1970s, with the first experimental GPS satellite launched in 1978. The system was designed to help the U.S. military accurately determine locations and navigate anywhere in the world using satellites.
Several scientists and engineers contributed to its development, including Bradford Parkinson, Roger Easton, and Ivan Getting.
GPS was later made available for civilian use, and the system became fully operational in 1995.
Today, GPS is used worldwide for navigation, smartphones, aviation, shipping, mapping, and many other everyday activities.
Final Answer: The United States Department of Defense originally developed GPS for military navigation.