Scientists Warn Of 'Dangerous Over-Reliance' On GPS   Developed nations have become "dangerously over-reliant" on satellite navigation systems such as GPS, which could break down or be attacked with devastating results, British engineers said Tuesday.The Royal Academy of Engineering said the application of the technology was now so broad -- from car sat-navs to the time stamp on financial transactions -- that without adequate backup, any disruption could have a major impact. "A significant failure of GPS could cause lots of services to fail at the same time, including many that are thought to be completely independent of each other," said Martyn Thomas, who led the academy's work on the issue. No-one has a complete picture of the many ways in which we have become dependent on weak signals 12,000 miles above us.
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