Open source applications for GPS?
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The excellent route-me project is open source and uses Open Street Map (among other map providers). It includes a sample application that I believe cannot be called fully functional, but it is fairly easy to extend it to fit most of the functionality of the built-in Maps application.
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Sharp Map is a geospatial application platform for .Net. Not sure if anyone tried this on an iPhone.
You might be able to work using mono touch
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