On 2011-02-08 13:57 , Thibouille wrote:
Alright, but if said changes or access point moves or there's no access point in sight it is useless.
in most urban locations there are multiple access points in range so it's not too hard for Skyhook to figure out that one is no longer where it used to be; there can be errors, but given that this is the system my 28-month-old iPhone has been using (along with GPS), i can vouch for its accuracy in appropriate locations (i can tell when it's using only GPS as it takes much longer to narrow down my location); newer Apple phones don't use Skyhook, but they use the same principle (Apple simply uses its own database of wifi locations instead)
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