When I'm trying to combine two img tiles from different maps mkgmap gives this warning: input file ...img has a different sort order Both maps are created with --code-page=1252 and --latin1 compiled with mkgmap-r2379. I even get this warning when combining two (or more) img tiles from the same mapset! This issue is only when I use gmapsupp in my args file and only when processing img's (not with osm.pbf files) and without gmapsupp it is ok. Consequence is that the address index is not readable on the gps device (on Mapsource it's fine). With gmaptool I notice the s-f value is 1, normally this is 2. See the attachment for more headers. My mkgmap args file is as follows: family-name=OFM_DBNL family-id=4931 product-id=1 overview-mapname=mapset draw-priority=20 tdbfile latin1 code-page=1252 show-profiles=1 net route index gmapsupp The last mkgmap version that didn't have this issue was r2328 What is going wrong here?