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Navigation without GPS

One thing I love about the nav unit in my Ford Fusion Hybrid is its ability to function without a GPS signal.  Sometimes in the morning it takes a few minutes to acquire the GPS satellites.  The nav unit still tracks the car's progress on the map!  I guess that its matching up speed, steering direction, and road data to determine where you are on the map.

This is particularly striking in a parking garage, where you can watch the car go around and around up the ramps with no GPS available.