This is an old error that mkgmap has been spitting for a while. I spent some time today splitting my map tiles in Northern Finland, and this is what I got now: 2012/04/20 20:55:34 WARNING (Subdivision): 63240012.osm.pbf: Subdivision width is 36627 at 3230916/1236133 The tile boundaries are: 63240012: 3171072,1169984 to 3266944,1368576 # : 68.043823,25.105133 to 70.101013,29.366455 The point ought to be around here, in a sparsely mapped area: http://www.openstreetmap.org/?mlat=69.327936&mlon=26.524535&zoom=12 The primary suspects for this error are these ways: http://www.openstreetmap.org/browse/way/25684606 highway = primary ref = 92 source = gps [I added a few attributes when splitting this road] and an administrative border with a very long line segment (69.1476278, 25.7386032) to (69.3421159, 26.6885093): http://www.openstreetmap.org/browse/way/32060780 I split the highway a little (adding bridges), but this failed to address the issue. I do not think that it is proper to add points to the OSM data of the administrative border. What could be done to fix the error? Could mkgmap insert some intermediate points to the border line segment? If the error comes from the highway, I guess I could split it a bit further. Best regards, Marko