the easiest way to create a contourlines map is phyghtmap <http://katze.tfiu.de/projects/phyghtmap/index.html> this tool is for creating osm Files containing the contourlines. In a second step you build the Garmin map with mkgmap like this: phyghtmap --start-node-id=1 -start-way-id=1 --max-nodes-per-tile=1000000 --max-nodes-per-way=250 --jobs=4 --o5m --no-zero-contour -s 50 -c 500,100 hgt_files/*.hgt java -jar mkgmap.jar --keep-going --max-jobs --read-config=options --style-file=contourlines_style --mapname=65188001 --description=contourlines --family-name=Contourlines --draw-priority=16 --gmapsupp *.o5m ---- options file: levels = 0:24, 1:23, 2:22, 3:21, 4:20, 5:18, 6:17, 7:16 reduce-point-density=20 transparent latin1 Ciao, Franco -- Sent from: http://gis.19327.n8.nabble.com/Mkgmap-Development-f5324443.html