If the compass interference popup is displayed while driving with the map set to direction up on my iPhone 3GS, how can I clear the popup without waving the iPhone in a figure 8?
A6. Speaker magnets and the alternator in your car can cause interference with the compass built into the 3GS iPhone. If this occurs, a popup will display asking you to move the iPhone away from the interference and re-calibrate by moving in a figure 8 pattern. Since this is unsafe while driving, you can simply tap on the popup and the map will switch from Direction Up to Course Up.
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