Hi After editing late in the day, I am trying to make a new map to load on my eTrex that highlights the remaining un-named ways for the next day, using mkgmap and a download of an .osm file using Josm of part of a suburb, using the following command as an initial trial. java -jar /Applications/mkgmap-r3118/mkgmap.jar --gmapsupp --style=noname /Users/xxxx/Documents/JOSM/Save_OSM_file/nonametest.osm and I get the following advice... Exception in thread "main" java.lang.UnsupportedClassVersionError: uk/me/parabola/mkgmap/main/Main : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) I assume a version incompatibility with mkgmap and my java version java -version java version "1.6.0_65" Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-10M4609) Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode) I can't run java 1.7 on this machine iMac7,1 System Version: Mac OS X 10.6.8 (10K549) Snow Leopard Kernel Version: Darwin 10.8.0 ...belatedly found this http://wiki.openstreetmap.org/wiki/Mkgmap/help/usage Pre-Requisites You need to download the following software / tools: Java Runtime Environment 1.7 from http://www.java.com mkgmap splitter Install Java Runtime Environment 1.7. Both mkgmap and splitter depend upon it. That seems plain enough even for me now - I must have a later Java version installed and this can't be done on this machine. ** Is it likely that the developers of mkgmap will recompile a version of the program in the near future so that it runs under java 1.6?