Hi I have used JOSM to download a section of the OSM along a railway corridor doing 4 saves into the same layer, then updated the data and saved the lot as an .osm file. I did it this way because the area was too big for one download using JOSM. But only a portion is made into a Garmin map for my eTrex, the last of the 4 sections saved. The dropbox image shows the size as JOSM sees the osm file when reloaded and the gmapsupp.img is the red rectangle https://www.dropbox.com/s/hfeo5zi48wxapl8/JOSM_save.png?dl=0 Is this the expected result? I wanted all the .osm saved file to be made into the gmapsupp.img I have tried this process several times with the same result. Here is the command used from iMac El Capitan 10.11.6 with Java8 Update 101. /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java -jar /Applications/mkgmap-r3695/mkgmap.jar —gmapsupp --style=default —transparent --description="Mkgmap” --family-name="OpenStreetmap Mkgmap” --series-name="Josm “ --area-name="default “ —route --drive-on=left --output-dir=/Users/MyDirectory/Documents/JOSM/Save_OSM_file/ /Users/MyDirectory/Documents/JOSM/Save_OSM_file/Josm_save.osm