> http://scpnt.stanford.edu/pnt/PNT11/2011_presentation_files/18_Lutwak-PNT2011.pdf Thanks. Wired: GPS Saves the World -- But Who'll Save GPS? http://www.wired.com/epicenter/2011/11/gps-save-world-save-gps/all/1 -- These are my opinions, not necessarily my employer's. I hate spam.