The upgrade to iOS 6 for iPads and iPhones has a setting which allows “advertisers” to track your postion and this setting is, by default, enabled. To find this “feature” go to Settings > General > About > Advertising. You need to turn the switch “On” to turn this off?
More information is available here;
http://www.businessinsider.com/ifa-apples-iphone-tracking-in-ios-6-2012-10#ixzz29PWZGE69