Even in such a tech-savvy culture as ours, understanding latitude and longitude coordinates has many uses. Coordinates can help hikers find their way when lost on a difficult trail and geocache enthusiasts locate their treasure. Even more importantly, they can help communicate location no matter what language is being spoken. Readers learn all about the development, use, and accuracy of the grid mapping system of latitude and longitude. Covering the equator, Prime Meridian, and more, the main content complements important topics from the social studies curriculum. Full-color maps aid readers' understanding as fact boxes clarify key information.