The thing is, guide apps need to be able to perform the moment you them the most - when you're lost, or when you're hungry. If you can't read the map the moment you need it, you can't find the resturant guide when you're straving and everyone is looking at you, or the batteries dies and you forget which train you should be taking, then you'll wish you brought the physical book.
I think you can take the current travel guide format and improve it, make it a bit more interactive. But the book metaphor really isn't optimal, as recongized by others here, a searchable, dynamic layout would be more useful. Ideally you'd want a camera, GPS and digital compass too.
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