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Nav system works without line-of-sight?
I noticed the other day that my GPS Navigation system seems to track location even if it doesn't have a line-of-sight to the sky. Both in a long tunnel and in a parking garage, it seemed to track my location. Does anyone know if the system has inertial tracking or some other trickery when it can't see the sky?
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2006 325i: Alpine White, Gray Leather, Steptronic, iDrive Navigation, Cold Weather Package, Premium Package, Comfort Access, Park Distance Control, Active Cruise Control, Premium Sound
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