This varies from model to model. Some models use GPS signals to determine their current location and orientation. The Qibla direction is then calculated and displayed on the screen.
For more information look up Global Positioning System.
I believe you are referring to a Qibla Compass. These are used to determine the direction of the Qibla, where Muslims face when praying.
It looks like this.............
The iPhone's digital compass application works just like any magnetic-needle compass. Launch the application by tapping the "Compass" button on the iPhone's.
here is the answer: http://mathforum.org/library/drmath/view/61130.html
You can determine the qibla direction by using a qibla compass, qibla-finding apps, or by using online tools. Alternatively, you can find your qibla direction by using landmarks and geographical knowledge if you are familiar with the general direction of Mecca from your location.
Whatever direction the red arrow points to is North from that you can infer other direction, However QiblaLocator makes finding the Qibla (direction to Mecca) as easy as looking up a map.
LCD screen, digital compass, and flashlight.what
Qibla Cola was created in 2003.
qibla direction from lahore
To reset a Bell mirror-mounted digital compass, you can usually press and hold a specific button on the device for a few seconds until the display resets. Refer to the user manual of your specific model for detailed instructions on how to reset the digital compass.
magnetic pull which is what the compass works off of.
A person could purchase a digital compass at any electronics store. Amazon sells digital compasses for between twenty and fifty dollars. You could also go to a local BestBuy and pick one up for around fifty dollars.