Basically that and... I'd say when you don't share the location, they only have what's available publicly from GeoIP (via ISPs). Wen you do, your user agent act

Basically that and... I'd say when you don't share the location, they only have what's available publicly from GeoIP (via ISPs). Wen you do, your user agent actively tries to give them the best possible results (using GPS or anything else), that's the way I would put it.