There is no more accurate way to communicate your location than using latitude and longitude—and it even transcends a language barrier! These coordinates can help rescuers save someone lost in the wilderness or geocachers discover their treasure. In this informative volume, readers learn about the development, use, and accuracy of the grid mapping system of latitude and longitude. The main content supports mapping topics in social studies classes, including an understanding of the equator and Prime Meridian. Full-color maps aid readers' understanding as fact boxes clarify key information.