Well this weekend I went to an event at UH, ya know college stuff. Anyway during a meeting which was totally meant for the parents and not the students I started looking through my phone. While I was looking around I found that I had a compass on my phone and it got me to thinking about physics. In class we learned that I compass is made of a magnetized pin which is pull to the geographic north leading you in the right direction. But on my phone, I know for sure that there is not pin inside of phone because i downloaded the app off of itunes, plus a magnet inside of the phone would ruin the device. So it really made me think what is making the arrow on my phone compass point north. Well I looked up how the iphone compass works and apparently there is a chip in the phone which senses a low frequency RF signal. This signal comes from a spot, North (apple build a Dharma station on the north pole), which has an accelerometer, the device can calculate the direction and orientation.
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