I am always suffering from the fact that I do not know any open, high performance physical storage format for navigation data, that allows very fast route calculation, incremental updating, etc.
That makes developing navigation applications pretty tough, because with every approach the storage format of the map data has to be reconsidered again.
While searching the internet I came across http://www.nds-association.org/, an association of all relevant car and infotainment manufacturers, developing exactly such a format. Maybe OSM should think about getting in contact with those guys and think about possible cooperations. Could be that having such a format is a kind of turbo boost for OSM into the car and PND market?

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