Hi all, I was able to reproduce the error messages reported by Felx : http://gis.19327.n5.nabble.com/SeaGenerator-in-overview2-branch-tp5761296p57... when I add something like this in the style\polygons file: natural=land [0x4a resolution 10] and use --precomp-sea. As I already wrote, the polygon type 0x4a is hardcoded in mkgmap: 1) mkgmap generates 0x4a polygons for the whole map when you don't use --transparent 2) polygons with type 0x4 are NOT divided by the PolygonSubdivSizeSplitterFilter I am not sure what to make of this. The default style doesn't assign 0x4a to a polygon, it doesn't even have a rule for the natural=land polygons generated by the SeaGenerator. I was already wondering why we generate them. I assume the special treatment of 0x4a in PolygonSubdivSizeSplitterFilter was added because of the bug that was fixed in r2612. This is what happens if I remove the special case for 0x4a: - With r2613 and the (unchanged) default style I see no change in any output file - With r2613 and the above modification I see that the error messages are gone So I guess I should just remove the special case? Gerd P.S. Felix, get well soon!