Interesting... its possible though that the ip mapping data that google uses is different\more accurate from the ones used by ad delivery companies. My notebook

Interesting... its possible though that the ip mapping data that google uses is different\more accurate from the ones used by ad delivery companies. My notebook was on my local wireless network unconnected to anything else and it found my location. I can't think of any way its doing that other than ip address. And even with a 3G wireless, Chrome\Firefox almost certainly doesn't have access to your cell tower location information, right?