I am the owner of a project that uses open source maps for an iPhone 2.0 app. My team and I are debating whether to upgrade to the iPhone 3.0 expose Map APIs, but I suspect that Google and Apple have put restrictions in just the wrong places. What barriers are out there?
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One very limiting feature of the map interface is you cannot implement turn by turn applications using Google map data (the dataproviders want more cash in their pocket for that). You can use the CoreLocation APIs to fetch position information, but would need to bring in another map source (Openstreetmap?) in order to calculate logical positions and routes.