1. A method of estimating the likelihood of a Wi-Fi enabled device being located within an estimated geographical area, the method comprising: the Wi-Fi enabled device receiving signals transmitted by Wi-Fi access points in range of the Wi-Fi enabled device; consulting a reference database to determine for each of a plurality of the Wi-Fi access points for which signals were received a last-known estimated position of the Wi-Fi access point; determining that at least a first set of the Wi-Fi access points for which signals were received have moved from their corresponding last-known estimated positions based on the last-known estimated positions for at least a second set of Wi-Fi access points for which signals were received; estimating, based on the number of Wi-Fi access points of the first set and the number of Wi-Fi access points of the second set, the likelihood of the Wi-Fi enabled device being located within an estimated geographical area; and displaying on a display device information based on the estimated likelihood of the Wi-Fi enabled device being located within the estimated geographical area.