Felix, Please enable info logging by using the attached logging.properties file and add this to the java options (note - it's a java option not a mkgmap option) -Dlog.config=logging.properties rerun with v2 of the patch and email me the mkgmap.log file(s). They should contain some diagnostic output that looks like this example: 2009/09/04 10:43:00 INFO (MapSplitter): 5195x7194, res = 22, depth = 0, size = 22359, lines = 711, shapes = 167, points = 31 2009/09/04 10:43:00 INFO (MapSplitter): 5195x3597, res = 22, depth = 1, size = 9752, lines = 288, shapes = 20, points = 7 2009/09/04 10:43:00 INFO (MapSplitter): 2597x3597, res = 22, depth = 2, size = 3725, lines = 75, shapes = 10, points = 3 2009/09/04 10:43:00 INFO (MapSplitter): 2598x3597, res = 22, depth = 2, size = 6027, lines = 213, shapes = 10, points = 4 Thanks, Mark