How does Chrome know my geolocation?

Question

Chrome seems to be very accurate in detecting my location. How does it do it? Can you point me to the source code?

Answer 1

Recently i worked on HTML 5 Geo-location assignment. Its supported in all modern browsers (IE9, Safari, FF, Opera).
But when I came to Chrome its not supported. I spent several hours in fixing this.
Finally I found a a solution:

The geolocation in Chrome is turned off by default. To activate it, users must go to their Chrome shortcut and add --enable-geolocation to the end of the target line, under the Shortcut tab.