BaseCamp and my Garmin Montana displays "US-Pittsburgh" as the mapset name, which is the LAST entry in my template.args Here is my mkgmap command: java -ea -Xmx1024M -jar \MKGMAP\mkgmap-r3665\mkgmap-r3665\mkgmap.jar --gmapsupp --description="Ohio 2016.2.10" --latin1 --index --x-split-name-index --bounds=\MKGMAP\OH\bounds --location-autofill=is_in,nearest --housenumbers --overview-mapname=Ohio-ov --overview-mapnumber=12380000 --remove-ovm-work-files --style-file=\MKGMAP\openmapchest-style\openmapchest --check-styles --family-id=665 --family-name="Ohio" --product-id=3 --series-name="Ohio 2016.2.10" --area-name="My maps" --min-size-polygon --route --drive-on=detect,right --check-roundabouts --check-roundabout-flares --remove-short-arcs --add-pois-to-areas --pois-to-areas-placement="entrance=main;entrance=yes;building=entrance" --generate-sea=extend-sea-sectors,multipolygon,floodblocker,close-gaps=6000 --make-poi-index --make-opposite-cycleways --process-destination --process-exits --tdbfile --poi-address --verbose -c template.args master_thin.txt Here is my template.args mapname: 12380000 description: US-Cincinnati input-file: 12380000.osm.pbf mapname: 12380001 description: US-Columbus input-file: 12380001.osm.pbf mapname: 12380002 description: US-Dayton input-file: 12380002.osm.pbf mapname: 12380003 description: US-Toledo input-file: 12380003.osm.pbf mapname: 12380004 description: US-Detroit input-file: 12380004.osm.pbf mapname: 12380005 description: US-Mansfield input-file: 12380005.osm.pbf mapname: 12380006 description: US-Pittsburgh input-file: 12380006.osm.pbf Which OPTION sets the mapset name in BaseCamp and GPS units? Greg