Google Maps knows where you are

Google Maps introduced a new feature recently that can determine your location when using their mobile version from a cell phone.   If your phone has GPS available it can use that to get a pretty precise location, otherwise it can somehow determine which cell tower you are on to get you an approximate location.   That is pretty powerful.

I wonder, though, how Google is able to determine which tower you are using.    That has some pretty big potential privacy issues if anybody you call or send a text message to, or any website you visit from your phone can somehow determine what tower you are on.

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