Hi Martin, Here are the commands that I have run (without problems in the past): java -Xmx1g -jar splitter-r171/splitter.jar ireland.osm.pbf java -ea -Xmx1560m -jar /Applications/mkgmap/dist/mkgmap.jar --description="Ireland" --country-name=Ireland --country-abbr=IRL --latin1 --family-name="Ireland" --series-name="Ireland" --style-file=./cliff_style --max-jobs --route --remove-short-arcs --adjust-turn-headings --add-pois-to-areas --family-id=1 --product-id=1 --net --road-name-pois --generate-sea=multipolygon --index --tdbfile ./6*.osm.gz python gmapi-builder.py -t osmmap.tdb -b osmmap.img -s M0000001.TYP -i osmmap.mdx -m osmmap_mdr.img osmmap.img 6*.img osmmap_mdr.img These command produce a gmapi directory which installs (with Garmin MapManager) when I double click it and click install. Bascamp can then see it in the Garmin Maps subdir of my Library. Then I use Garmin Mapinstall to install it onto my garmin unit. Notice that I am not simply producing a gmapsupp.img file but instead going though the above hoops so that I can have address search working on the gps unit (Oregon 550t). I don't have problems with a simple gmapsupp.img file using the latest mkgmap version. Are you able to produce an address-searchable map on your gps unit with the current version of mkgmap? Thanks, Cliff.