Global positioning System

The document provides an introduction to GPS (Global Positioning System). It discusses how early humans navigated using methods like piles of stones or stars, and the development of modern navigation ideas like radar and sonar. It describes the history of GPS, which was developed by the US Department of Defense, launched its first satellites in 1978, and became fully operational in 1995. The document explains that GPS uses triangulation based on distance measurements to satellites to determine precise locations on Earth. It provides examples of GPS applications for military and civilian uses such as navigation, mapping, and tracking fishing fleets.