It doesn't require you to actually log-in to that network, it simply has a database which stores access point (AP) IDs and their corresponding (GPS) locations. The PSP than does a sweep to see what kind of APs are in range and based on their signal strength, does a very rough approximation on location. Pretty simple really. Cheers.
That's really clever. Have you got it, and if so, would you recommend it?
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