How to use OSM with GPSMAP 76S

osm_generic_windows.exe installs a nice looking map in MapSource if an appropriate the TypFile - for instance mapnik.typ - is applied. Buildings, lakes, woods ... are displayed monochrome in different colors. But loading selected maps to my GPSMAP 76S which has a black-and-white screen frequently result in unreadable displays – especially wooden areas cover all other map features and tracks. Using JAWAWA I tried several TypFiles but without success. Is there a ready to use solution for this problem? alfred