Hi,
I'm not sure, if I have already written about this problem, sorry if I
repeat myself.
Routing between maps require external nodes at the same position on both
maps. With rectangular tiles external nodes are created only at borders
of the tiles (at least this is what I would expect). Different maps most
probably do not get the same borders of tiles in common area, co there
is no correct external nodes for routing.
My idea is to create external nodes at each intersection of
administrative border with routable road. Since administrative borders
and roads are the same for all maps, then external nodes should appear
at exact the same position for all maps. This would allow (I hope, I
haven't tested) for seamless routing between maps.
From point of view o a user of mkgmap, there could be an option,
indicating which borders should be used for creating nodes. Something like:
--external-nodes=admin_level2
--
Best regards,
Andrzej
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