Augmented reality feedback

I am developing an application for use in shopping malls. I want to use the augmented reality concept -- when some one is nearer to mall, then I calculate the distance to the mall by getting the current location. Then I display the mall name and distance to the mall on the image in a camera view.

How do I rotat开发者_开发问答e the image if someone is going in the wrong direction? Should I use the accelerometer? I don't know how. Should I correlate the data given by the accelerometer to the mall coordinates? If there is any other possible solution, let me know. Thanks in advance.

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If you want the direction the device is pointing you need to use the compass, not the accelerometer

Take a look at CoreLocation, specifically the CLLocationManager and the CLHeading classes.