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Calibration apparatus for automatic magnetic compass correction

  • US 4,031,630 A
  • Filed: 06/17/1976
  • Issued: 06/28/1977
  • Est. Priority Date: 06/17/1976
  • Status: Expired due to Term
First Claim
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1. Apparatus for providing a deviation-corrected output signal representative of an actual compass heading comprising:

  • a magnetic compass providing an output signal representative of an indicated compass heading;

    means for storing deviation-correction signals representative of the deviation of the compass for each of a plurality of different indicated headings;

    means for retrieving the stored deviation-correction signal corresponding with the indicated compass heading in response to the output signal from the compass;

    means responsive to the retrieved deviation-correction signal and to the compass output signal for producing a deviation-corrected output signal representative of the actual compass heading; and

    a calibration circuit, includingmeans for providing signals representative of the actual heading of the compass;

    means for providing the compass output signal to the calibration circuit;

    means responsive to the signals representative of the actual heading and to the compass output signal for providing signals representative of the difference therebetween; and

    means for causing the difference signals to be stored by the storing means.

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