Azimuth processing device, azimuth processing method, azimuth processing program, direction finding device, tilt offset correcting method, azimuth measuring method, compass sensor unit, and portable electronic device

A portable electronic device comprising:

• a compass sensor sequentially outputting measurement data;
• an exterior package having a screen;
• an offset data updating section that accumulates the measurement data so as to update offset data of said compass sensor based on the accumulated measurement data;
• an operation guidance control section that indicates a guidance on the screen to operate said compass sensor to change its positions during the accumulation of the measurement data;
• and
• an azimuth data output section that outputs azimuth data based on substantially newest measurement data and the updated offset data.

A method of calibrating a portable electronic device having a compass sensor that sequentially outputs measurement data, and a display unit having a screen, the method comprising:

• displaying on the screen an indication that guides a user of the portable electronic device to conduct an operation to move the portable electronic device, the operation allowing the compass sensor to output measurement data necessary for updating offset data of the compass sensor;
• accumulating the measurement data sequentially outputted from the compass sensor while the user conducts the operation to move the portable electronic device;
• and
• updating the offset data of the compass sensor based on the accumulated measurement data.