To pinpoint location, the Core Engine uses a massive reference network comprised of the known locations of over 100 million Wi-Fi access points and cellular towers. To develop this database, Skyhook has deployed drivers to survey every single street, highway, and alley in tens of thousands of cities and towns worldwide, scanning for Wi-Fi access points and cell towers plotting their precise geographic locations. Skyhook's extensive coverage area includes most major metro areas in North America, Europe, Asia, and Australia.
Arithmetic is being able to count up to twenty without taking off your shoes. -- Mickey Mouse