I just tried it with svn-2982 (under scratchpad not my n800) and it lists:

:/work/compile/libgarmin/src/src/garmin.c:217:1|:libgarmin 0.1 initializing as GPS Backend
:/work/compile/libgarmin/src/src/garmin.c:471:1|:Loading /home/neil/gmapsupp.img as disk image
:/work/compile/libgarmin/src/src/garmin_rgn.c:1024:4|:Have 978 mapsets
:/work/compile/libgarmin/src/src/garmin_mdr.c:222:1|:HDR len =708 our=554
:/work/compile/navit/src/navit/map/garmin/garmin.c:983:1|:Using builtin types
:/work/compile/navit/src/navit/map/garmin/gar2navit.c:66:1|:Please define: poi_goverment_building
:/work/compile/navit/src/navit/map/garmin/gar2navit.c:66:1|:Please define: poi_bussines_service
:/work/compile/navit/src/navit/map/garmin/gar2navit.c:66:1|:Please define: poi_bussines_service

Unfortunately I have no idea how to get something of this map shown. I guess I have to search for something. What towns in what country does it contain?