Compass app for the iPad

I've recently acquired a compass app for my iPad. How does it detect magnetic north
09:36 Tue 14th Feb 2012
 
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probably by using GPS
the iphone (from the 3gs onwards) has AK8973 3-axis Electronic Compass made by Asahi Kasei Microsystems fitted to it.

http://images.applein...suppli-1-090624-2.jpg

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