Hi, I tried to generate coastlines according to this : http://gis.19327.n5.nabble.com/coastline-td5745923i20.html At the end, when I ran mkgmap I got an error : Exception in thread "main" java.lang.NoClassDefFoundError: org/opengis/referencing/crs/CoordinateReferenceSystem at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2615) at java.lang.Class.getMethod0(Class.java:2856) at java.lang.Class.getMethod(Class.java:1668) at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486) Caused by: java.lang.ClassNotFoundException: org.opengis.referencing.crs.CoordinateReferenceSystem at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ... 6 more My command : java -Xms$JXMS -Xmx$JXMX -cp "$WORKDIR"/mkgmap/dist/mkgmap.jar:../lib/optional/* \ uk.me.parabola.mkgmap.sea.optional.PrecompSeaGenerator \ "$SHAPEDIR"/land_polygons.shp WGS84 sea-"$DATE" java version "1.7.0_75" OpenJDK Runtime Environment (IcedTea 2.5.4) (7u75-2.5.4-1~trusty1) OpenJDK 64-Bit Server VM (build 24.75-b04, mixed mode) Can you see where I failed ? Steph