Patent ID: 9121706
Filing Date: 2015-09-01
Classification: G01C

Abstract:
1. A device for use with a compass, the device comprising: an input for receiving signals from the compass; a memory device; and a processing circuit configured to determine magnetic compass headings using the signals received from the compass; wherein the processing circuit is further configured to determine true headings; wherein the processing circuit is configured to calculate a deviation for each of a plurality of headings, each deviation comprising a difference between a magnetic compass heading and a true heading; wherein the processing circuit is configured to use the deviations for each of the plurality of headings to calculate a plurality of compass deviation coefficients representative of different types of noise sources; wherein at least one compass deviation coefficient is determined based on a database of geographic zone error factors stored in the memory device and based on a position of the compass; wherein the processing circuit is configured to update the database of geographic zone error factors using an internet connection; and wherein the processing circuit is configured to store the deviation coefficients in memory and to at least one of calibrate the compass and adjust an output from the compass using the compass deviation coefficients.