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The iPad only has GPS on the 3G model. Wi-Fi only iPads simulate GPS by using Skyhook type positioning by triangulating based on supposed Wi-Fi router locations.

It looks like a Wi-Fi only iPad is using real GPS (reading the signal from the GPS satellites) but it's not. Accuracy isn't anywhere close to real GPS.

That's true but if iPad 2 is tethered or Hotspot'd from iPhone 4 (and some other smartphones), it will get true A-GPS signal from the phone.
 
That's true but if iPad 2 is tethered or Hotspot'd from iPhone 4 (and some other smartphones), it will get true A-GPS signal from the phone.

Tethered to iPhone 4, yes. I've been told it doesn't work on iPad 1 but I don't have one to try it on.

Like I said I've found GPS to be very accurate even when running off my MiFi which does have GPS capabilities as well. Not sure how it passes that on over WiFi or whatever.
 
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