Mozilla built a crowd-sourced database of Wi-Fi, cell, and Bluetooth network locations, collected by volunteers running an Android "stumbler/war-driving" app. I

Mozilla built a crowd-sourced database of Wi-Fi, cell, and Bluetooth network locations, collected by volunteers running an Android "stumbler/war-driving" app. I helped start this project for Firefox OS, which is mostly defunct but the Mozilla Location Service (MLS) is still used for Firefox Nightly and DevEdition on the desktop. :-) Here is a zoomable map of the location data coverage: https://location.services.mozilla.com/map https://location.services.mozilla.com/map Mozilla exchanges the cell location data with the OpenCellID project. Mozilla's cell database is available for download here: https://location.services.mozilla.com/downloads https://location.services.mozilla.com/downloads For privacy reasons, the Wi-Fi and Bluetooth databases are not currently downloadable, but they can be queried through a web service API: https://location.services.mozilla.com/api https://location.services.mozilla.com/api