Perhaps you have read about geocaching somewhere. Maybe one of your outdoor friends have mentioned it in passing. Or maybe you just found this blog and wondered what the heck geocaching is. Here is the answer.
In short, geocaching is a high tech treasure hunt. It involves a geocacher hiding a container somewhere on public property and marking the exact longitude and latitude using a GPS receiver. After the placer publishes the cache on geocaching.com, other people can go and find it, using their own GPS receivers, (GPSr). At a bare minimum, the cache will contain a logbook and usually a pencil. When found by a geocacher, they will sign the logbook and put the cache back in the same spot for the next finder. You can find more about this great fun activity here.