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3. Software Design

Process for calibrating the electric compass

　・The magnetic sensor's magnetic accuracy and the compass's azimuth accuracy

　・General information on the calibration of magnetic sensors

　・Principles of magnetic sensor calibration

　・Foundations of azimuth calculation

　・Tilt compensation for azimuth calculation

　・Tilt compensation for azimuth calculation is impossible without an accelerometer

　・Magnetic declination correction for electric compass

　・Attitude calculation

　・Method for converting a sensor's measured value to a magnetic field

　・Method for converting a digital-type magnetic sensor's measured value to a magnetic field

　・List of principles for compass calibration

　・Orthogonal correction in magnetic sensor

　・Search offset

4. test/calibration/trouble shooting 

　・Method for testing the electric compass

　・Test for Android devices with an onboard electric compass

　・Causes of obstacles in electric compass accuracy

　・Product datasheet