This highly accessible, mathematics-free treatment provides specialists and nonspecialists alike with valuable insights into the revolutionary Navstar Global Positioning System- a space-based radionavigation system that enables an unlimited number of users to receive passively their longitude, latitude, and altitude. In clear, straightforward prose, this comprehensive treatise- -explains what the Navstar GPS is and how it compares with other space-based navigation systems -illustrates how you can use it effectively to find your position, velocity, and the exact time -helps you select the right Navstar receiver in keeping with your needs and budget -outlines the many ways you can take full advantage of Navstar GPS -shows you how to enhance its performance capabilities -discusses the many applications that have already produced significant benefits for its users