Play with the coordinate calculator here: http://xkcd.com/geohashing Every day, the algorithm generates a new set of coordinates for every region. They are randomly placed -- they could be in the forest, in a city, or on a mountain. Unless you can predict the stock market, you can't figure out what the coordinates will be ahead of time. You can first calculate a weekday's coordinates at about 9:30 AM (Eastern), and on Friday morning you can calculate the coordinates for each day that weekend. Origin: http://xkcd.com/426/ Wiki: http://wiki.xkcd.com/geohashing/Main_Page Enjoy! -Jon PS. For those of you who don't know, XKCD is a web comic of sarcasm, romance, math, and language. I suspect that GPSes fall into the math category.