Patent ID: 8825425

Claim:
A correction method of a geomagnetic sensor in a mobile device, comprising: the mobile device having a geomagnetic sensor comprising a three-axis geomagnetic sensor, position detection means for detecting a position of the mobile device, and a controller operable to control the geomagnetic sensor and the position detection means, the position detection means includes an acceleration sensor that detects a predetermined position change; and the controller starts a correction process of the geomagnetic sensor based upon the detection; wherein the correction process includes: starting a correction process of the three-axis geomagnetic sensor on a first plane based upon detection of a first position change of part or all of the mobile device that includes a rotational movement on the first plane; and starting a correction process of the three-axis geomagnetic sensor on a second plane different from the first plane based upon detection of a rotational movement of part or all of the mobile device on the second plane.