“Here, at last, Richard Easton and Eric Frazier present in plain, simple language how a positioning, navigation and timing system originally developed for military purposes―one that Air Force Space Command continues to operate and maintain―became essential for countless civil and commercial activities around the world. The authors deftly place the concept and development of GPS within two broader historical contexts: navigation and robotic spaceflight.”
— from the foreword by Rick W. Sturdevant, PhD, Deputy Director of History, Air Force Space Command
