Anyone can put them out there. You just have to make it weather proof, record the exact location (gps) and put the info. up on one of the many geocaching sites so that others can go look for it. The one's I have been involved with are usally rated (easy, moderate, difficult, etc.). The difficult one's can turn out to be something the size of a film cannister hidden in the jungle...so it's "difficult" to find.