First time accepted submitter neiras writes "Mozilla is building a map of publicly-observable cell tower and WiFi access points to compete with proprietary geolocation services like Google's. Coverage is a bit thin so far but is improving rapidly. Anyone with an Android phone can help by downloading the MozStumbler app and letting it run while walking or driving around. The application is also available on the F-Droid market."
"Thin" is relative; it's quite a few data points since we first mentioned the pilot program a few months ago