And, then it wasn't until they were driving for thirty minutes that they realized they had put in a

　　destination back on the West Coast where they lived. They actually put their home address in. So

　　again, the_GPS_is_kind_of_“garbage_in_garbage_out”．

　　Mr Brown says this is a common human error. But, he says, what makes the problem worse

　　has to do with some of the shortcomings, or failures, of GPS equipment.

　　Barry Brown：“One problem with many GPS units is they have a very small screen and they

　　just tell you the next turn. Because they just give you the next turn, sometimes that means that it

　　is not really giving you the overview that you would need to know that it's going to the wrong

　　place.”

　　Barry Brown formerly served as a professor with the University of California, San Diego.

　　While there, he worked on a project with Eric Laurier from the University of Edinburgh. The

　　two men studied the effects of GPS devices on driving by placing cameras in people's cars. They

　　wrote a paper based on their research. It is called “The Normal, Natural Troubles of Driving

　　with GPS.”

　　Barry Brown: “One of the things that struck us, perhaps the most important thing was that you have to know what you're doing when you use a GPS. There are these new skills that people have developed. There are these new competencies that you need to have to be able to use a GPS because they sometimes go wrong.”

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