Write an app that gets the location and orientation of the phone, and provides a progress bar that indicates whether or not the phone is facing your birthplace. (If you are facing your birthplace the progress bar is full, if you are facing the wrong way the progress bar is empty, and everything else is inbetween.) Make the phone beep or buzz when the phone comes to facing within 10 degrees of your birthplace.
Use best practices for all aspects of the code!