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




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