I am not sure if this is a splitter or mkgmap bug. In my map generated from Geofabrik's finland.osm.bz2, in the national border between Finland and Sweden, the name Sverige (name:sv for Sweden) occurs three times, apparently once per map tile. In the *.osm.gz files output by splitter, only the relation 52822 has name=Sweden, and that relation does occur in every *.osm.gz tile file. In the generated gmapsupp.img, the name occurs in two labels, like this: SVERIGE/SVERIGE/SVERIGE/NORRA NORRLAND/NORRA NORRLAND/NORRA NORRLAND/NORRBOTTENS LÄN/NORRBOTTENS LÄN/NORRBOTTENS LÄN/SUOMI SVERIGE/SVERIGE/NORRA NORRLAND/NORRA NORRLAND/NORRBOTTENS LÄN/NORRBOTTENS LÄN/SUOMI For some reason, the second occurrence is apparently only using two of the tiles. The desired label would mention each area only once. Would it be possible for mkgmap to merge relations between input tiles, if each carries the same id? A quick-and-dirty solution might be a not-substring filter that would not append the relation name to the mkgmap:boundary_name in the relations file if it is already contained. But I am wondering if the duplicate relations could be causing other problems. Best regards, Marko