The network connection is also used to update map information and provide extra detail, though clearly you are not too worried about finding the nearest McDonalds or Post Office bobbing around on the North Sea. As a matter of interest iPhones and iPads send details of your location to Apple. This is used to maintain a crowd-sourced database of phone masts and Wi-Fi hotspots, which is supposed to help refine the initial location fix. Apple is keen to make it clear that this information is encrypted and anonymous, though a bug discovered in 2011, now fixed, revealed that an unencrypted file on iPhones stored a year's worth of time-stamped location data. This data is still retained, but now only for 7 days.
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