Many a times you must have seen the comapss app asking you to calibrate it by drawing that figure '8' pattern. Most of the phones will issue a message "Abnormal magnetic field detected. Please calibrate your device" when you run the compass application. Most of the time, drawing a figure '8' won't work as expected.
There is no need to tap the 'Calibrate' menu and draw a perfect figure '8' with screen facing the sky. This video shows a very easy way to calibrate every time you run comapss, map or any other app that requires compass.
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