Hi WanMil, I see a NPE when I execute mkgmap with parm --precomp-sea, but without --generate-sea: java.lang.NullPointerException at uk.me.parabola.mkgmap.reader.osm.SeaGenerator.init(SeaGenerator.java:125) at uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource.pluginChain(OsmMapDataSource.java:163) at uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource.setupHandler(OsmMapDataSource.java:131) at uk.me.parabola.mkgmap.reader.osm.bin.OsmBinMapDataSource.load(OsmBinMapDataSource.java:56) at uk.me.parabola.mkgmap.main.MapMaker.loadFromFile(MapMaker.java:144) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:56) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:210) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:207) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) Gerd -- View this message in context: http://gis.19327.n5.nabble.com/PATCH-v3-Precompiled-sea-tp5708423p5708922.ht... Sent from the Mkgmap Development mailing list archive at Nabble.com.