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Galaxy S 2 (I9100) compass calibration

The compass sensor is calculated from both the accelerometer and magnetic field sensors, which needs calibration to be accurate.
If the values reported by the compass sensor are not right, you can recalibrate the magnetic field sensor with the following steps:

Connect to the device via ADB with sufficient permissions and run:

adb shell stop zygote
adb shell rm /data/misc/akfs.txt
adb shell start zygote

Then start an application using the compass sensor and move the device in every direction, with a rotation around each axis: the device should now be calibrated.