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Portable navigation device with integrated GPS and dead reckoning capabilities

DC
  • US 6,850,844 B1
  • Filed: 06/28/2002
  • Issued: 02/01/2005
  • Est. Priority Date: 06/28/2002
  • Status: Expired due to Term
First Claim
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1. A method for navigation using a portable navigation device equipped with a GPS receiver and a dead reckoning positioning functionality, the method comprising the steps if:

  • determining a current position of the device using the GPS receiver so as to calculate a route through a network of thoroughfares;

    if the determination of the current position as determined by the GPS receiver is at least partially degraded, determining the current position of the device using the dead reckoning positioning functionality; and

    if the determination of the current position as determined by the GPS receiver is substantially accurate, calibrating the dead reckoning functionality using the GPS receiver.

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