You have to compile mkgmap with the SeaGenerator. I think these are the mimimal steps: 1) if you don't have the sources, get them via svn or download the tarball : http://www.mkgmap.org.uk/download/mkgmap-r2464-src.tar.gz 2) install the java compiler, see http://www.mkgmap.org.uk/develop.html and do what is described under "Minimum requirements",
3) to compile mkgmap with the PrecompSeaGeneraor change the build.xml: search for a line like this: <exclude name="**/optional/*.java"/> and replace it with <exclude name="**/dem/optional/*.java"/> Without this change, some required classes are not compiled. 2) execeute ant resolve-optional to download the needed jar files 3) download latest splitter from http://www.mkgmap.org.uk/download/splitter.html, unzip, and and copy splitter.jar and \lib\fastuitl.jar to mkgmap\lib\optional 4) execute ant 5) chdir to mkgmap\dist 6) execute mkgmap with a command similar to this: D:\mkgmap\dist>java -Xmx5000m -cp mkgmap.jar;..\lib\optional\* uk.me.parabola.mkgmap.sea.optional.PrecompSeaGenerator f:\osm\land-polygons-split-4326\land_polygons.shp WGS84 e:\sea
Hope that helps?
Thank you, this helps a lot. I was trying it on my Windows machine with good success. At the moment step 6 is running. What difference does it make to download the split polygons instead of complete polygons? I am also trying to get it running on a Linux server. It was fine up to step 5. But at step 6 there is an error. My command is: java -Xmx5000m -cp mkgmap.jar;../lib/optional/* uk.me.parabola.mkgmap.sea.optional.PrecompSeaGenerator ../../land-polygons-split-4326/land_polygons.shp WGS84 ../../sea And the result is: Usage: java [-options] class [args...] (to execute a class) or java [-options] -jar jarfile [args...] (to execute a jar file) ... -bash: ../lib/optional/ant-1.8.2.jar: Permission denied Permissions of this file are rw-rw-r.