How routers are added to location database?

Ok, I know that, but I guess there's something else Galt. Almost anybody in my town would know how to submit their router, not even have the interest to do it.

In my first post, I meant to say "people with iPhone" could be uploading routers and its locations unconsciously.

Yes, I was close, thanks for that article, I should have read it before. However it would be more simple to understand if we just post this:

Crowd-sourced Wi-Fi and cellular Location Services

If Location Services is on, your device will periodically send the geo-tagged locations of nearby Wi-Fi hotspots and cell towers in an anonymous and encrypted form to Apple, to augment Apple's crowd-sourced database of Wi-Fi hotspot and cell tower locations. In addition, if you are traveling (for example, in a car) and Location Services is on, a GPS-enabled iOS device will also periodically send GPS locations and travel speed information in an anonymous and encrypted form to Apple, to be used for building up Apple's crowd-sourced road traffic database. The crowd-sourced location data gathered by Apple does not personally identify you.

Just one more question. It is reasonable that routers only can provide their 48-bit MAC address when just listening around, so that it is associated with its location; but what about repeated MAC addresses? I've been told that although they're are supposed to be unique identifiers, it could happen that they get repeated in another part of the world.