[ Thanks to Britta Wuelfing for
this link. ]
“As the user joins the Internet per VLAN, the software
scans the MAC addresses of all the access points in the area and,
if successful, locates the user and gives his position to a
querying website. Users can also feed their position and access
point data manually to the database. The collected data lands in
Skyhook’s WiFi database, which is not publicly
accessible.”