The other day I watched an episode of Hak5 – Spoofing the W3C Geolocation API were Darren was introducing us to the W3C geolocation API. (Btw. Hak5 is so awesome, you definitely have to check them out right now if your don’t know them already). This API uses certain informations like IP address, RFID, WiFi and Bluetooth MAC addresses, and GSM/CDMA cell IDs to determine the exact location of a users computer. It’s implemented by browsers like Firefox and Chrome.