The new Geolocation extension is an improvement (and replacement) of a similar feature embedded in the Reports Extension. Geolocation is really important for who has a World-wide public and needs to target one or more specific countries.
The Geolocation extension adds to the targeting tab of each newsletter a new country filter:
where near each country the number of active subscribers is shown.
This extension is even responsible to geolocate your subscribers, replacing the old featured provided by the Reports Extension.
Read more about the Geolocation Extension.