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It appears that --generate-sea=polygons no longer works as I get the following error. Note --generate-sea=multipolygons doesn't come up with this error. Regards, Markus_g java.lang.NullPointerException at uk.me.parabola.mkgmap.reader.osm.SeaGenerator.removeAntiIslands(SeaGe nerator.java:452) at uk.me.parabola.mkgmap.reader.osm.SeaGenerator.end(SeaGenerator.java:1 98) at uk.me.parabola.mkgmap.reader.osm.OsmReadingHooksChain.end(OsmReadingH ooksChain.java:69) at uk.me.parabola.mkgmap.reader.osm.xml.Osm5MapDataSource.load(Osm5MapDa taSource.java:74) at uk.me.parabola.mkgmap.main.MapMaker.loadFromFile(MapMaker.java:149) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:56) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:220) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:217) at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source ) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Exiting - if you want to carry on regardless, use the --keep-going option