When we originally proposed the Gears Geolocation API the goal was to deliver location enabled web sites on mobile phones. Today Google Gears is adding WiFi signals to the Geolocation API so that laptop users can benefit from location enabled web sites for the first time and mobile users from the increased accuracy. The Geolocation API is the same for developers in both desktop and mobile browsers and therefore the same code on both platforms.
Source:Google Code Blog: Introducing the Gears Geolocation API for all laptop WiFi users