I was curious about how the iPhone 3G S's compass feature work. After looking at Apple's patents and hardware discussion, I found the answer. The solution is actually quite simple. For a copy, email me.

1. How the Apple iPhone 3G S Magnetometer Works. By Dr. ArsenyLebedev B.S. Ph.D

2. Compasses are attracted to the Earth’s poles using Magnets Source: Everyone knows that.

3. The iPhone 3G S does not use magnets.

5. http://weeksmd.com/?p=1521

6. http://blogs.crikey.com.au/planetalking/2009/03/06/electromagnetic-interference-back-in-frame-as-possible-cause-of-qantas-a330-incidents/

7. http://machinegunkeyboard.com/?p=254

9. Electronic Solution Apple must be utilizing simple RF to determine North.

11. John W. Jewett, Raymond A. Serway,Physics for Scientists and Engineers with Modern Physics, pp 532-545, Brooks/Cole, 2007

12. Possible Flaw: How does Apple transmit an RF signal around the world?

13. Obvious Answer Apple has built a Dharma station on the North Pole to transmit a signal!

14. Contact arseny@magnetismstudios.com Twitter: @arseny Oh, and check out FileMagnet, which really does use magnets: