Hello I'm trying to use a separate file with natural=coastline information. I then provide it to mkgmap using option: --coastlinefile=lithuania_coast.osm But I get this when executing: SEVERE (CoastlineFileLoader): lithuania_.osm: java.lang.UnsupportedOperationException java.lang.UnsupportedOperationException at java.util.AbstractCollection.add(AbstractCollection.java:238) at java.util.AbstractCollection.addAll(AbstractCollection.java:322) at uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource.createConverter(OsmMapDataSource.java:251) at uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource.setupHandler(OsmMapDataSource.java:131) at uk.me.parabola.mkgmap.reader.osm.xml.Osm5MapDataSource.load(Osm5MapDataSource.java:69) at uk.me.parabola.mkgmap.reader.osm.CoastlineFileLoader.loadFromFile(CoastlineFileLoader.java:90) at uk.me.parabola.mkgmap.reader.osm.CoastlineFileLoader.loadFile(CoastlineFileLoader.java:119) at uk.me.parabola.mkgmap.reader.osm.CoastlineFileLoader.loadCoastlinesImpl(CoastlineFileLoader.java:133) at uk.me.parabola.mkgmap.reader.osm.CoastlineFileLoader.loadCoastlines(CoastlineFileLoader.java:79) at uk.me.parabola.mkgmap.reader.osm.SeaGenerator.init(SeaGenerator.java:135) at uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource.pluginChain(OsmMapDataSource.java:158) at uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource.setupHandler(OsmMapDataSource.java:126) at uk.me.parabola.mkgmap.reader.osm.xml.Osm5MapDataSource.load(Osm5MapDataSource.java:69) at uk.me.parabola.mkgmap.main.MapMaker.loadFromFile(MapMaker.java:145) 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(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636) I tried creating coastline file using JOSM. Then I tried modifying this file (removing elements with action="delete" etc.). The last thing I've tried was to provide the full data osm file (the one used to generate a map) as natural coastline just to check that file format is OK, but I was still getting the same error... Full command line when creating a map: java -jar mkgmap.jar \ --style-file=/home/tomas/garmin/tomas_style \ --gmapsupp \ --tdbfile \ --family-name=OpenStreetMap \ --description=Lietuva`date +%Y%m%d` \ --country-name=Lithuania \ --country-abbr=LTU \ --preserve-element-order \ --lower-case \ --charset=windows-1257 \ --route \ --add-pois-to-areas \ --generate-sea=multipolygon \ --coastlinefile=lithuania_.osm \ lithuania_.osm What am I doing wrong? What should the format of this coastline file be? Thank you P.S. This is using rev1838. -- Tomas Straupis