Hi WanMil, I got a mystery coastline error that I am unable to fix, because I fail to see any inverted sea and land on the map. It would be very helpful if these messages mentioned the original way IDs or just a map coordinate of the whereabouts of the error. Best regards, Marko 2011/02/13 11:16:31 WARNING (MultiPolygonRelation): 63240006.osm.gz: Multipolygon http://www.openstreetmap.org/browse/relation/4611686018427479706 contains errods. 2011/02/13 11:16:31 WARNING (MultiPolygonRelation): 63240006.osm.gz: Polygon 4611686018427486359(8P)(4611686018427482944[8P]) carries role inner but lies inside an inner polygon. Potentially its role should be outer. 2011/02/13 11:16:31 WARNING (MultiPolygonRelation): 63240006.osm.gz: Polygon 4611686018427486368(13P)(4611686018427482953[13P]) carries role inner but lies inside an inner polygon. Potentially its role should be outer.