I am trying to build a routable map for all of Massachusetts as a first step towards hopefully improving the style rules slightly (some ramps on Rt. 2 are missing from the cloudmade img and I think it's because trunk_link is missing in the style file, but I haven't figured that out yet). My command line is pretty much as the one in README.example. After running the splitter on cloudmade's massachusetts.osm I ran: java -enableassertions \ -Xmx2048m \ -jar mkgmap.jar \ --tdbfile \ --gmapsupp \ --family-id=632 \ --overview-mapname=40000001 \ --country-abbr="US" \ --country-name="United States" \ --region-abbr="MA" \ --region-name="Massachusetts" \ --description="OSM gdt" \ --ignore-osm-bounds \ --net \ --route \ --add-pois-to-areas \ --remove-short-arcs \ -c template.args > OUT.02.mkgmap 2>&1 As you can see I do have remove-short-arcs. I think I am r1048 but will update and try again. I got the following errors, which I thought --remove-short-arcs was supposed to fix. I looked at NEW HOPE WAY, and it is nearly a loop with very close nodes even though it is really a simple linear alley for which two nodes would do fine. I looked at another one (29730871) and that looks bizarre as well: http://www.openstreetmap.org/?way=29730871 I think the ways appear multiple times due split tiles, which is fine. The rewulting img/gmapi loads into Garmin mapmanager (mac) but RoadTrip says it is broken and cannot be used. So two thoughts: if ways are still messed up, maybe they should just be omitted? it would be nice to give a URL to the way instead of just the id. I suspect a lot of these are messed up and should be fixed in the db regardless of mkgmap liking them or not liking them. I have done sort|uniq on the actual output: SEVERE (RoadNetwork): Road NEW HOPE WAY (OSM id 11175820) contains consecutive identical nodes - routing will be broken SEVERE (RoadNetwork): Road null (OSM id 29730871) contains consecutive identical nodes - routing will be broken SEVERE (RoadNetwork): Road null (OSM id 30158233) contains consecutive identical nodes - routing will be broken SEVERE (RoadNetwork): Road null (OSM id 30574531) contains consecutive identical nodes - routing will be broken SEVERE (RoadNetwork): Road null (OSM id 30574585) contains consecutive identical nodes - routing will be broken SEVERE (RoadNetwork): Road null (OSM id 30575415) contains consecutive identical nodes - routing will be broken SEVERE (RoadNetwork): Road null (OSM id 9208777) contains consecutive identical nodes - routing will be broken SEVERE (RoadNetwork): Road null (OSM id 9252537) contains consecutive identical nodes - routing will be broken SEVERE (RoadNetwork): Road null (OSM id 9325924) contains consecutive identical nodes - routing will be broken SEVERE (RoadNetwork): Road null (OSM id 9563279) contains consecutive identical nodes - routing will be broken