Question: what led to the development of the global positioning system

title: Global Positioning System
text: The GPS project was launched in the United States in 1973 to overcome the limitations of previous navigation systems , integrating ideas from several predecessors , including a number of classified engineering design studies from the 1960s . The U.S. Department of Defense developed the system , which originally used 24 satellites . It was initially developed for use by the United States military and became fully operational in 1995 . Civilian use was allowed from the 1980s . Roger L. Easton of the Naval Research Laboratory , Ivan A. Getting of The Aerospace Corporation , and Bradford Parkinson of the Applied Physics Laboratory are credited with inventing it . 

Answer: answer: The GPS project was launched in the United States in 1973 to overcome the limitations of previous navigation systems, integrating ideas from several predecessors, including a number of classified engineering design studies from the 1960s.  It was initially developed for use by the United States military.
answer: It was originally developed for use by the United States military and became fully functional in 1995.