As there is no GPS built into any Macs other than the iPhone and iPad the only "global positioning thing" would be coming from
  1. cookies stored on the computer
  2. the specific DNS servers you are connecting to which are probably those of your ISP
  3. the particular network the user is connected to
  4. the particular search engine you and/or the user are connected to
None of which is under your control or ability to manage. From your description, I would assume that the first item, cookies, is the most likely cause in this case. You are really the only one who can test this out which as Jon suggested you can do by deleting your own cookies. I don't know how you would go about deleting the cookies on other people's computers and I really don't think I would want to attempt it either.

Perhaps if you could give us a better idea of what you are attempting someone may be able to suggest an alternative technology.

If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein