Send a comment on this item to LII: Send a comment on this item to LII staff, who on weekdays will usually reply within 24 hours. Global Positioning System Primer Information about the global positioning system (GPS), an aerospace technology that uses satellites and ground equipment to determine positions anywhere on Earth and used today by the military and in navigation and mapping. Includes a brief history of navigation, a GPS timeline, and links to related sites. From the Aerospace Corporation, "a federally funded research and development center in support of national security, civil and commercial space programs." http://www.aero.org/education/primers/gps/ Asterisk * indicates required field. Your Name Your Email Address * We will not sell or provide your email address to anyone else. Comment * Enter the verification code as it is shown in the box below. This helps prevent automated submissions. *