Can anyone find out why mkgmap is throwing this error since quite a few time when one tries to compile the Africa extract from Geofabrik? This happens using both default style, as my own style-file. I don't think it's related to --max-nodes=300000 as this is already quite low. I'm using the following options: mkgmap.jar --max-jobs=3 %generate-sea% --reduce-point-density=5.4 --reduce-point-density-polygon=8 --suppress-dead-end-nodes--delete-tags-file=deletetags --transparent --blacklist-tags-file=deletetags --adjust-turn-headings --add-pois-to-areas --ignore-maxspeeds --ignore-turn-restrictions --remove-short-arcs=4 --description=openmtbmap_%abr% --route --country-abbr=%abr% --country-name=%country% --mapname=%FID%0000 --family-id=%FID% --product-id=1 --series-name=openmtbmap_%abr%_%date% --family-name=mtbmap_%abr%_%date% --tdbfile --overview-mapname=mapset --area-name="%country%_%date%_openmtbmap.org" -c d:\garmin\mkgmap_680\maps\template.%country% Complete output below: END DOCUMENT SCHWERWIEGEND (Polyline): 65360000.osm.gz: Problem writing line (class uk.me.parabola.imgfmt.app.trergn.Polyline) of type 0x1e containing 3 points and starting at http://www.openstreetmap.org/?mlat=1.02299&mlon=-7.53589&z oom=17 SCHWERWIEGEND (Polyline): 65360000.osm.gz: Subdivision shift is 0 and its centre is at http://www.openstreetmap.org/?mlat=2.59361&mlon=-7.69180&zoom=17 SCHWERWIEGEND (Polyline): 65360000.osm.gz: deltaLat = -73196 END DOCUMENT END DOCUMENT END DOCUMENT END DOCUMENT END DOCUMENT END DOCUMENT END DOCUMENT END DOCUMENT SCHWERWIEGEND (MapSplitter): 65360007.osm.gz: Area too small to split at http://www.openstreetmap.org/?mlat=14.71812&mlon=-17.46835&zoom=17 (reduce the density of points, length of lines, etc.) SCHWERWIEGEND (MapSplitter): 65360007.osm.gz: Area too small to split at http://www.openstreetmap.org/?mlat=14.72337&mlon=-17.47039&zoom=17 (reduce the density of points, length of lines, etc.) SCHWERWIEGEND (MapSplitter): 65360007.osm.gz: Area too small to split at http://www.openstreetmap.org/?mlat=14.71812&mlon=-17.46835&zoom=17 (reduce the density of points, length of lines, etc.) SCHWERWIEGEND (MapSplitter): 65360007.osm.gz: Area too small to split at http://www.openstreetmap.org/?mlat=14.72337&mlon=-17.47039&zoom=17 (reduce the density of points, length of lines, etc.) SCHWERWIEGEND (NOD1Part): 65360007.osm.gz: Region contains too many nodes/arcs (discarding 1 nodes to be able to continue) SCHWERWIEGEND (NOD1Part): 65360007.osm.gz: Expect the routing to be broken near BBox[14,72290/-17,47047, 14,72292/-17,47045] SCHWERWIEGEND (NOD1Part): 65360007.osm.gz: Region contains too many nodes/arcs (discarding 1 nodes to be able to continue) SCHWERWIEGEND (NOD1Part): 65360007.osm.gz: Expect the routing to be broken near BBox[14,72395/-17,47054, 14,72398/-17,47051] SCHWERWIEGEND (NOD1Part): 65360007.osm.gz: Region contains too many nodes/arcs (discarding 1 nodes to be able to continue) SCHWERWIEGEND (NOD1Part): 65360007.osm.gz: Expect the routing to be broken near BBox[14,71773/-17,46873, 14,71775/-17,46871] SCHWERWIEGEND (NOD1Part): 65360007.osm.gz: Region contains too many nodes/arcs (discarding 1 nodes to be able to continue) SCHWERWIEGEND (NOD1Part): 65360007.osm.gz: Expect the routing to be broken near BBox[14,71855/-17,46800, 14,71857/-17,46798] java.lang.AssertionError at uk.me.parabola.imgfmt.app.net.RoadIndex.write(RoadIndex.java:45) at uk.me.parabola.imgfmt.app.net.RoadDef.writeLevelDivs(RoadDef.java:218) at uk.me.parabola.imgfmt.app.net.RoadDef.writeNet1(RoadDef.java:142) at uk.me.parabola.imgfmt.app.net.NETFile.write(NETFile.java:58) at uk.me.parabola.mkgmap.build.MapBuilder.makeMap(MapBuilder.java:222) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:96) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:61) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:189) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:186) at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Exiting - if you want to carry on regardless, use the --keep-going option