Feb 8th 2014, 23:00, by Robert Sorokanich
GPS is a godsend when it works. Problem is, there are plenty of places it doesn't work—tall skyscrapers, concrete overpasses, and other huge structures all block the satellite signal you need to navigate. Luckily, Swiss company u-blox just devised a chip that keeps you on course when the satellites drop out, using the most old-fashioned of navigation techniques: dead reckoning.
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