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ACCURACY INDICATIONS FOR AN ELECTRONIC COMPASS IN A PORTABLE DEVICE

  • US 20100307015A1
  • Filed: 06/05/2009
  • Published: 12/09/2010
  • Est. Priority Date: 06/05/2009
  • Status: Active Grant
First Claim
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1. A machine-implemented method for providing a user with accuracy indications for a compass, comprising:

  • calculating a plurality of instances of a geomagnetic field;

    calculating a plurality of instances of an average magnitude of a subset of the plurality of instances of the geomagnetic field;

    detecting whether said average magnitude changes by more than a first predetermined threshold; and

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

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