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How does dead reckoning work?

Dead reckoning is accomplished by monitoring your speed and direction and using this data to keep track of your position relative to a known starting location.

Different techniques can be used to measure speed and distance when GPS reception is lost:

Sophisticated systems may combine data from sensors with map data to more accurately plot your course along curves and turns in a road.

The effectiveness of dead reckoning depends on how accurately a navigation system is able to monitor your speed and direction.

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