You can now do lots related to travelling with the help of your iPhone all because of the hard work put in by the iPhone developers. Various iPhone applications make use of the compass installed in your iPhone to give you lots of information regarding positioning and directions. Some of the great things that you can do are:
How the iPhone compass works
The offshore iPhone developers have put in a lot of effort and researched on this topic, not just to build compasses that deliver the highest accuracy but also compasses that are: compatible with all versions of the iPhone, easy to navigate and also blend in well with your model of the iPhone. The principle that your iPhone compass uses is that of a magnetometer in iOS. In addition to this magnetometer there is an accelerometer present and this acts as your digital compass giving you precise directions provided there are no other strong magnetic fields around you, as the presence of any other magnetic field will alter the effects produced by Earths own magnetic field thereby giving you false information. Therefore in the absence of any external field, your iPhone will detect just the Earths intrinsic magnetic field, thus giving your device precise directional navigation with respect to that of the geomagnetic North Pole. But as always the geomagnetic and geographical North Pole does vary, its nothing to do with your application but thats the case with the Earth itself, the extend of this depends on your location.
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