“We call it a second eye watching over you.”
Isaac Daniel, an engineer who invented a line of sneakers with a tiny Global Positioning System chip embedded into them.  Mr. Daniel got the idea after he got a call from his 8-year-old son’s school in 2002 saying the boy was missing. The worried father hopped a flight to Atlanta from New York where he had been on business to find the incident had been a miscommunication and his son was safe.
Daniel, who wears the shoes when he runs every morning, says he tested the shoes on a recent trip to New Jersey. It tracked him down the Atlantic Coast to the Miami airport and through the city to a specific building.