Cache in" on the fastest growing outdoor activity for the whole family with The Essential Guide to Geocaching: Tracking Treasure with Your GPS. This comprehensive guide provides a fun way for both beginner and seasoned geocachers to learn the fundamentals of the game and its exciting variations, as well as land navigation, outdoor ethics, and safety skills. By logging on to a geocaching website, anyone from the young to the young at heart can locate coordinates to a hidden cache, plan their route, and be on their way with map, compass, and GPS receiver to locate hidden "treasure.