For those parents that are nervous about their kids, and really want to know where their children are, then they should probably purchase the Amber Alert GPS 2G device.  It works as a GPS beacon, which allows not-so tech savvy parents text to find out the exact location of their kid.  True, I’m not certain whether a longitude and latitude will help, but the “Breadcrumbing” feature allows them to track their steps like Billy from the Family Circus.  The Amber Alert costs about $379.99, with monthly plans being $9.99 and $59.99.