[email protected] schrieb:
> Hi,
> I am trying to develop a mobile phone web application and would like
> to know a bit more how Google locates a user. I want to assume that
> the user does not have GPS.
>   
What do you mean be "Google"? I assume, you mean the Google Maps for 
Mobile application? If so, there are a couple of options, by which a 
user is located. First the IP, as you already suspected. Furthermore the 
cell info and the BSSIDs of WiFi networks around are also used in order 
to fix the users position. And last but not least - GPS.

GMM is closed, alternatively you might have a look onto what Google 
Gears provides, or even SkyhookWireless (the latter have a SDK for 
various OS, including Windows Mobile and S60). They all have solutions 
to locate a machine based upon those information. I have done a 
comparison between 4 XPS (XPS is the sum of WPS, CPS, GPS and IPS) 
technologies and it is sometimes amazing, how accurate the WPS things 
work :)


> Does it use the IP address of the base station to which the user is
> attached as surely this would be inaccurate?
> Cheers
> John
>
>
> >
>
>   


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