Differences of geolocation accuracy between browsers

I try to know why when I use the geolocation with differents browsers on a same computer I have differents results. I know the implementation of the feature is not perfect..but, it's strange because I try on a computer with chrome and FF4.1 and i got a good accuracy. On the same computer IE give me a bad accuracy. When I try on an other comp开发者_如何学运维uter with chrome and FF 4.1, Chrome give me a good result and firefox the same bad accuracy as IE (ip location i guess ).

If anyone have a solution to get the same accuracy for all browser or just an explication ?

Let's assume the location is computed using Google Street informations (wifi hotspots and cell phone repeaters).

For wifi, the geolocation module looks at signals received by the wifi adapter. Those signals are emitted from wifi access points. Google cars assessed the emission power of each access points, as well as their location, when driving around. From the relative strength of the signals received by the user wifi adapter, which is available to the geolocation module, the location of the wifi access points in sight, and their assumed transmission power, it is easy to determine where the user's wifi adapter is located.

However the computed position will varies if one of the received access point varies its own power, or is shadowed by something between it's antenna and the receiver's antenna.

Note that this will be similar when the geolocation is computed using cell phone signals.

If the location is done using GPS signal with a GPS receiver embedded in the computer, then your are back to general issue of GPS position determination (number of satellites in sight, their relative position, their height on the horizon, and signal reflexion). GPS normal accuracy is "within a radius of 30 m", that is 60 meters / 200 ft.

If the location determination is done using a mix of all available techniques, then the result will varies also according to the weight assigned to each technique in the final result.