Bridget Belardi presented a session and field trip at the DEN National Institute on Geocaching, a treasure hunt for all to enjoy!  We used a GPS and coordinates to locate caches hidden around Silver Spring, MD.  While finding the prize was a thrill, we enjoyed seeing parts of the city we would not have otherwise have visited which was equally nice.  Bridget maintains a website, http://belardi.wikispaces.com/geocaching, full of info. 

Not sure you are ready for a live geocache adventure, try a virtual cache.  Math teachers should checkout www.mathbits.com