A recent update to Apple's privacy policy states that they store and share the precise location of user's devices:
To provide location-based services on Apple products, Apple and our partners and licensees may collect, use, and share precise location data, including the real-time geographic location of your Apple computer or device.
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apple.com ]
They claim that this data is not stored in a personally identifiable form, but elsewhere in their privacy policy they state that they do not consider each device's unique ID to be personal information. Which makes sense, there is no commercial value in "sharing" the data if it can't result in location based advertising to a specific device.
Opting out does not appear to be an option and there is no mention of time limitations on data storage. Presumably everywhere you go with your apple device is being stored.
I'm curious to see whether this will cause the kind of public outcry that it would if the policy update happened at Google or Microsoft.