I find it amazing how this thread is so dramatically negative about the use of a GPS. Where are the names of the manufacturers of the units and the programmers that sell these death machines. I think most of the references are a friend of a friend stories and there are no references to the hundreds of millions of people successfully using a GPS.
There are many members of these forums that say they rely almost entirely on various electronic gadgets for planning their trips and decry the use of paper maps. As was mentioned in replies, you need to use your common sense first, don't blame the GPS for these silly people who court death on their own.