Is there any documentation on this extension's API anywhere? As far as I can tell, this is the API used for enwiki geonotices and I'm looking for a way to test geonotices with a location other than my real location - but any documentation at all would be helpful.
Topic on Extension talk:GeoIP
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For anyone who stumbles across this, adding the following to the bottom of your common.js seems to be enough:
$(document).ready( function() { Geo.lat=0; Geo.lon = 0; });
Replace the numbers with whatever lat/lon you want.