Hi Gerd, I have uploaded example at http://files.mkgmap.org.uk/download/392/test-crash.7z. java.lang.IndexOutOfBoundsException at java.nio.Buffer.checkIndex(Unknown Source) at java.nio.DirectByteBuffer.getShort(Unknown Source) at uk.me.parabola.mkgmap.reader.hgt.HGTReader.ele(HGTReader.java:203) at uk.me.parabola.mkgmap.reader.hgt.HGTConverter.getElevation(HGTConverter.java:108) at uk.me.parabola.mkgmap.reader.hgt.HGTConverter.getHeights(HGTConverter.java:302) at uk.me.parabola.imgfmt.app.dem.DEMSection.calcTiles(DEMSection.java:127) at uk.me.parabola.imgfmt.app.dem.DEMSection.<init>(DEMSection.java:74) at uk.me.parabola.imgfmt.app.dem.DEMFile.calc(DEMFile.java:96) at uk.me.parabola.mkgmap.build.MapBuilder.makeMap(MapBuilder.java:322) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:107) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:69) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:263) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:259) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Exiting - if you want to carry on regardless, use the --keep-going option -- Best regards, Andrzej