[mkgmap-dev] Set Family ID value

Hi, I have another question about map conversion. Currently I am trying to add a very simple overly map, additionally to my existing ones. The right way seems to be to choose another Family-ID? But somehow mkgmap ignores the option, and still creates "6324xxxx.img" files, which collides with existing maps and does not load on the device. Am I using this wrong?

java -jar mkgmap/mkgmap.jar --draw-priority=30 --transparent --style-file=hike --gmapsupp --tdbfile --family-id=6868 overlay.txt saarland-latest.osm.pbf Thanks for any help why this fails Jakob