Edit to my previous post: we found out that it depends on the android version which are used AND you all should try to use a garmin map together with a alternative map that means lay a garmin map into the map folder and the other map then hook the garmin map off and use the alternative map in walking mode only car mode under android 4..2 crashes!

however this sticks together i don't know but it's working here with german osm maps Some OSM developers reported that there will be new maps start of december...