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All iPhones and 3G iPads have proper GPS units.
The suggestion that they don't is an urban legend perpetrated by people who do not properly understand what AGPS is.
Basically if your device has network access, it improves the time to first fix by downloading the GPS almanac instead of waiting for it to trickle down from the satellites.
If you have no network access, then they are a bit slow to get a fix, but once they do, the performance is good.
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