The scoop: Apple’s iPhone is NOT storing your accurate location, and NOT storing history - GeoThought Blog
Oops, that was supposed to go into our "Worth a Click" section! User error!
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"The quick summary: I believe I have confirmed that Apple is not storing your location, but the (actual or estimated) location of cell towers (and WiFi access points) that are close to you, to help locate you as you move (these are not necessarily towers that you have been in communication with). In the data I have examined there is nothing that is based on the accurate location of the iPhone. For a good example, see my previous post showing the location of cell equipment in Coors Field baseball stadium, and not revealing the location of my home which is very close to there. In my opinion, if Apple was storing this data in order to know where you had been, they would be storing different, more accurate location data that they have access to."