We should be downloading and caching vector data, not pre-rendered bitmap tiles. Vector data would consume far less local storage, and would make local route calculations possible.
There is a precedent for this on the Android platform with OneStepAhead's MapDroyd & NavDroyd applications. This app is the closest I've seen to that class of proper/robust offline mapping program. Then biggest shortcoming of OpenMap is dealing with bitmap tiles instead of vectors.
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