Jon live just inside graticule [39,-77] in Silver Spring, MD. He doesn't have a GPS device, but he's willing to make educated guesses about where exactly the day's geo hash spot is based on what he sees on Google Maps and/or where he sees large congregations wearing anti-velociraptor shirts. Right now he's new to geo hashing and the XKCD community, but he looks forward to going places he shouldn't and meeting people his friends wouldn't approve of.
 Graticules of Interest
Jon lives practically on the corner of all of these Graticules, and is interested in whatever hash happens to be closest to him.