OK, if Google didn't drive by, then another company could've -- or perhaps someone used an Android device near your house. For instance, check this map to see

OK, if Google didn't drive by, then another company could've -- or perhaps someone used an Android device near your house. For instance, check this map to see whether Skyhook Wireless has wardriven by your house: http://www.skyhookwireless.com/howitworks/coverage.php http://www.skyhookwireless.com/howitworks/coverage.php And again, they don't need your router. You just need to have a WiFi receiver in your computer, turn it on, and your computer will scan for nearby networks. The MAC addresses of your neighbors' networks are checked against those in Google's database. If Google finds three or more, it knows exactly where you are.