How does Empathy in Ubuntu 9.10 determine my geolocation?

[Detlef Lechner]

Hi,
I would like to know: 
how does Empathy in Ubuntu 9.10 determine my geolocation?
 http://xmpp.org/extensions/xep-0080.html
http://blog.pierlux.com/2009/06/15/geolocation-in-empathy-now-real/en/

Kind regards,
Detlef Lechner
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