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Accuracy indications for an electronic compass in a portable device

  • US 7,921,572 B2
  • Filed: 06/05/2009
  • Issued: 04/12/2011
  • Est. Priority Date: 06/05/2009
  • Status: Expired due to Fees
First Claim
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1. A machine-implemented method for providing a user with accuracy indications for a compass, comprising:

  • calculating a first plurality of instances of a geomagnetic field;

    calculating a second, different plurality of instances of the geomagnetic field;

    calculating an average magnitude of the first plurality of instances of the geomagnetic field;

    calculating an average magnitude of the second plurality of instances of the geomagnetic field;

    detecting whether the average magnitudes of the first plurality of instances and the second plurality of instances differ by more than a first predetermined threshold; and

    informing the user that compass accuracy has degraded, in response to having detected that the average magnitudes differ by more than the first predetermined threshold.

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