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What are the differences between Core Location on iPod Touch and iPhone?

I think the GPS chip is only present on the iPhone. But for some reason, my iPod Touch seems to know my position, even without a GPS chip. So what does this mean for Core Location? What should I consider when using Core Location on iPhone and iPod Touch? What are the differences?

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The iPhone uses A-GPS technology (A means "help"), so the cellular network and Wi-Fi networks help the GPS chip determine your location. Depending on your location, this can lead to more precise triangulation of your position.

While iPod touch cannot use GPS satellites or cell towers to determine your location, it can use Wi-Fi, so your iPod touch knows where you are.

As for the CoreLocation APIs, there shouldn't be a difference between devices, however the accuracy is likely to be lower and less consistent on iPod Touch.

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I believe the API is the same. All that differs is the accuracy of the location, which is returned to you through the API.

iPhone uses GPS to get a fairly accurate lock of your location, while iPod Touch uses IP-Location or Wifi-Triangulation technology, which is less accurate than iPhone GPS.

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iPod touch uses this method for kernel location information.

http://en.wikipedia.org/wiki/Skyhook_Wireless

-t

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