Calibrate the digital compass (magnetometer) on a Samsung Galaxy S

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There is many ways (Google is your friend), the quickest way I found is the following :

• Install GPS Status : https://play.google.com/store/apps/details?id=com.eclipsim.gpsstatus2&hl=en
• Start it and go the Tools menu
• Choose Calibrate compass
• Do what you’re told ;)