Geocaching (http://www.geocaching.com): Geocaching.com is the first and "Official Global GPS Cache Hunt Site" for geocachers around the world
. On this site, the locations of millions of geocaches are listed, along with easy to follow steps on getting started with geocaching. A free basic membership is available for those interested in geocaching.
NaviCache (http://www.navicache.com): NaviCache.com is a more liberal geocaching site in terms of the information provided to geocachers. While all comments and posts are reviewed and approved, less information, specifically detailed location information, is held from the public. A membership, however, is required to access information posted on NaviCache.com.
TerraCaching (http://www.terracaching.com): TerraCaching is a community that has the locations for caches around the world. This information is exclusively for members. The limited amount of cache listings found on TerraCaching.com provides for a challenging and enjoyable cache hunt, rather than filtering through hundreds of doubtful cache listings.