Hi all, I've noticed the following problem with boundary relations (type=boundary, boundary=administrative), e.g. http://www.openstreetmap.org/relation/170953 is cut into pieces with the attached areas.list By default, splitter will not keep them complete, and it is likely that this relation appears in more than one tile. When you use --add-pois-to-areas mkgmap will generate a POI based on the existing data, and this POI will have the tag place=city (for the example), so for each tile we calculate different coordinates for the city POI. I guess this happens with other relations as well. You can solve this particular problem by telling splitter to keep all administrative boundaries complete, but that will produce a lot more data in each tile: --boundary-tags=administrative So, I see two possible solutions: 1) change splitter so that it keeps mp-relations complete when they have a tag like place. A new option could specify a list of those tags . 2) change mkgmap so that it doesn't generate a POI for mp-relations with incomplete outer ways. What do you think? Gerd