Hi not only the north sea, other sea polygons, too i use these options to create my maps over a long time for my own devices i use a smaller daily used map around bonn/germany without any coastline, so i can't say what is wrong and since which time. as example the command line options for the sri lanka extract and some lines from the mkgmap log any hints? Bernd java -ea -Xmx6G -jar /home/bernd/map_build/splitter-r421/splitter.jar --geonames-file=/home/bernd/map_build/cities15000.zip --mapid=65030001 --output=o5m --precomp-sea=/home/bernd/map_build/sea_20150206.zip --write-kml=sri_lanka.kml --keep-complete --overlap=0 --split-file=/home/bernd/map_build/areas/sri_lanka_areas.list /home/bernd/map_build/o5m/sri_lanka.o5m java -ea -Xmx6G -Dlog.config=/home/bernd/map_build/mkgmap_log.props -jar /home/bernd/map_build/mkgmap-r3472/mkgmap.jar --read-config=/home/bernd/map_build/styles/basemap_style/options --bounds=/home/bernd/map_build/bounds_20150206.zip --precomp-sea=/home/bernd/map_build/sea_20150206.zip --generate-sea --style-file=/home/bernd/map_build/styles/basemap_style --name-tag-list=name:de,name,name:en,int_name --mapname=65031001 --family-id=4 --product-id=44 --description=sri_lanka_20150219_1200_basemap --family-name=Basemap --draw-priority=10 /home/bernd/map_build/tiles/*.o5m /home/bernd/map_build/styles/styles_typ.txt 2015/02/21 18:06:00 INFORMATION (SeaGenerator): /home/bernd/map_build/tiles/65030001.o5m: Load precompiled sea tiles 2015/02/21 18:06:00 INFORMATION (SeaGenerator): /home/bernd/map_build/tiles/65030001.o5m: Started loading coastlines from sea_262144_3702784.osm.pbf 2015/02/21 18:06:00 INFORMATION (SeaGenerator): /home/bernd/map_build/tiles/65030001.o5m: Finished loading coastlines from sea_262144_3702784.osm.pbf -- amarok2 now playing: