title: How to build a compass with the iPhone?
body: <p>After some searching on Google, I ask myself:</p>
  
  <p>Is it possible to build a compass (simple showing the heading/direction) with
  the iPhone 3G's GPS sensor?</p>
  
  <p>I have the suspicion, that this is only possible, if the device is moving.</p>
  
  <p>Any ideas are appreciated.</p>