How Google Latitude track your location?

Google Latitude can track your location only by giving permission to the browser.

How does he identify your location on the map on PCs without GPS?How Google Latitude track your location?
By IP address i think.
It seems to be with your IP address and the Wifi spots arround.

This site gives you a hint.

http://www.mozilla.com/en-US/firefox/geolocation/

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How Google Latitude track your location?
it uses the internet to track were you are and pin point were you are on the mapHow Google Latitude track your location?
Your computer has an IP address that can be used to determine where you are.