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