No it's not a compass or an astrolabe. It's not semaphore or a smoke  signal. Not an RFID tag or a neon sign or phosphorous flare either.
Give up?
It's the GPS Smart Shoe™ recently mentioned in Forbes Magazine, developed by GTX Corp (OTCBB: GTXO.OB) and licensed to Aetrex Worldwide.  Yes, a shoe... well a very smart shoe as it can tell a caregiver the  precise location, bearing, history, speed and altitude of an Alzheimer's  victim that has eloped or wandered. No small feat - pun intended - to  reduce the overwhelming stress on the millions of victim caregivers  while potentially saving thousands from injuries and death owing to  exposure, accidents and criminal activity. The GPS Shoe also reduces the  manpower drain on municipal services; fire, police and welfare agencies  often enlisted to locate the mentally ill.
While a Finalist in the Most Innovative Location Device category of the  Locations & Beyond Summit and the People's Choice Awards is a  wonderful acknowledgment for the years GTXO invested in developing the  solution and the promise that Aetrex  has made in brining the Shoe to market... the real winners are those  touched by this devastating disease for which there is no cure, but now  have a new measure of hope.