Geocaching is a fast-growing new sport that's a great way to practice GPS navigation skills. The concept is simple. One person hides a container that typically includes a log book, instruction sheet, and a few trading items--the cache--and posts its latitude and longitude coordinates on an Internet web site. Other people look up the coordinates of the cache on the web, then use their GPS receivers to try to find it. When they do, they sign the log book, and if they want, take an item. According to geocaching etiquette, if you take an item you must leave another item to replace it. When finished, the cache (pronounced cash) is returned to its hiding place for others to find.

It sounds easier than it is. Your GPS receiver will typically only get you to within about 20 or 30 feet of the cache location, and the cache is often camouflaged and small. Once you get in the general vicinity, it's up to you to search around until you find it.

If you'd like to learn more about this outdoor treasure hunt suitable for the entire family, check out these two web sites:

geocaching.com
navicache.com

Offset Caches:

Are you an experienced geocacher who wants to find more challenging caches? Click here to learn how to find offset caches. (PDF file 240k)