1. A device for use with a first access point, a second access point and a third access point, first location information based on a geodetic location of the first access point, second location information based on a geodetic location of the second access point, and third location information based on a geodetic location of the third access point, the first access point being operable to transmit a first packet, the second access point being operable to transmit a second packet, said device comprising: a scanning module operable to receive the third location information, the first packet and the second packet; and a position estimator operable to estimate a position of said device based on the first packet, the second packet and the third location information.