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  
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.

Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java -jar 
--family-name="OpenStreetmap Mkgmap” 
--series-name="Josm “ 
--area-name="default “ 
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