I have committed a converter that converts one or more precompiled boundary files to GPX files. This is necessary to answer the numerous questions "Why is this street not mapped to town A" etc. It is also very useful for the development. How does it work? Call java -cp mkgmap.jar uk.me.parabola.mkgmap.reader.osm.boundary.BoundaryFile2Gpx bounds_200000_50000.bnd This creates a GPX files from the boundary file named gpx/bounds_200000_50000.bnd/admin_level=<L>/<L>_<id>_<O>_<n>.gpx where <L> = admin_level <id> = boundary id (r3000 = Relation 3000; w29945 = way 29945) <O> = o means outer boundary, i means inner boundary (same meaning as in multipolygons) <n> = an ascending number within each id The GPX files makes it easy to analyze the files with JOSM or any other GPX viewer. By the way: This is a PERFECT place for anyone who want to start with mkgmap source code contributions. Having a few Java experiences you can start here to improve the converter or for example to write a check tool that outputs uncovered areas for each admin_level. If you have any question about that feel free to ask me. It's really not very complicated. WanMil