Caches or stashes of provisions, hidden along a route were a common occurrence in Lewis and Clark"s day when foot travel was really the only mode of long distance transportation. Today, caches of another sort are hidden throughout the United States and the world for that matter. With the introduction of the personal GPS unit, people everywhere have been learning to use these new devices and participating in what can only be called a high-tech treasure hunt. By logging on to a geo caching website, anyone can locate coordinates to a hidden cache, plan their route, and be on their way with map, compass, and GPS receiver. The hidden cache contains a logbook and a number of trinkets that can be traded by fortunate seekers. Participation in geo caching has exploded in the last four years to over 190 countries and hundreds of thousands of outdoor enthusiasts. A fun way to learn basic land navigation skills. Provides outdoor ethics and safety information, including resources and product guides. Это и многое другое вы найдете в книге The Essential Guide To Geocaching: Tracking Treasure with Your GPS (Mike Dyer)