Yeah the way the iPhone does it right now (or one way anyway) is you can have your app in the background and registered to be woken up when a "significant" change of location occurs, which is something the phone does all the time so you get it for free.
Maybe with iOS 5 they're adding to the API so that you can do periodic high quality locations (i.e. once every 15 minutes so as not to drain the battery) or something like that.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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