Geocaching is a popular, fast-growing outdoor activity embraced by people of all ages and abilities from avid hikers to families with young children. Players use a Global Positioning System (GPS), smartphone, or other mobile device to find hidden containers (geocaches) or designated landmarks, sign their logbooks, and then share their experiences online. For information on applying for a permit, what materials may be hidden, and the areas where geocaching is allowed, read Directive 06-01 (PDF) on geocaching, letterboxing and related activities.