Currently, without your permission required, you can be tracked within 200 km. That provides you a measure of personal privacy.
However, Yong Wang, a computer scientist at the University of Electronic Science and Technology of China in Chengdu, has developed a three-stage tracking system that narrows the radius of geolocation without requiring the user’s permission to within a few hundred metres. He uses the fact that many organizations have in-house servers and the IP addresses of these servers map directly to a specific location on a map, thus using businesses and universities as landmarks to achieve much higher accuracy.
Read more at: NewScientist