Mating of the mobile with location sensing devices may launch the next big wave in personal appliances Way to go: The first GPS enabled phone for pedestrians. From the star of Bethlehem that guided the three Magi to the manger where Christ was born to John Denver's soulful ballad which went, "Country road, lead me home!,' location sensing and guidance has remained high on our wish list of fervently sought-after technologies. But wishing does not always mean getting and navigation: celestial, maritime or personal, has remained a complex and often exacting science.