Where did you download the map, garmin.openstreetmap.nl? It supports only latin1.
Try https://extract.bbbike.org/ and choose a map format for Garmin with UTF-8 and see if it works.
Where did you download the map, garmin.openstreetmap.nl? It supports only latin1.
Try https://extract.bbbike.org/ and choose a map format for Garmin with UTF-8 and see if it works.