Explorers Unit

We are getting ready to begin a unit on mapping and exploration. I have been wanting to set up a geocache for our class since the begining of the year, but I haven't quite gotten it off the ground. I am wondering if any parents have experience geocaching, or orienteering? I would like to set it up for one of our Saturday make up days in March or April so we can get outside in the courtyard! Let me know if you are interested in helping!