Sorry for this double post... and out of topic idea...
but I was just reading some info on route calculation and pathfinding... and I think I could try to port an A* pathfinding code. I never ever looked at PSP coding but anyway if I start something I'll try it first on a simple windows implementation.
I'd like to know if you have any more info on the geodata files. I think It should be possible to get some "nodes" and link them to calculate the path (I'll try a really basic path finding at first... ignoring one-way road).
If I can do anything to add this feature to MapThis I'll do my best to help. I think it's a "necessary" feature when your on the go without any Wifi access.
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