We stared geocaching about 5 years ago. We are campers who do not like shopping malls but like to have something to do when we are camping. When we started geocaching, you had to have a special gps unit. But now, if we know we are going to spend the afternoon geocaching, we pick up the gps unit because we can get more information about the caches. But if we are doing something else and just decide to look for a cache, we use the app on our phones. I agree nuffsaid. Go to geocaching.com. There are some caches you can find with free membership. There are other caches and you get more information with a paid membership. I think it is $30 a year. We call it cheap entertainment for the year. There is a lot of information on the site. The app we use on our iPhones is "Geocaching". The web site and the app are linked so you get the same information on your phone. We find it a lot of fun. The grand-kids call it "Treasure Hunting!"