I wanted to give OsmAnd a try, to replace my dependency on Google services. I could not for the life of me find a setting to correclty transliterate Japanese names to my native language. I only found three states: 1) Display original Japanese characters 2) Transliterate. Here the problem was, that oftentimes, it used the chinese pronounciation of the characters instead of Japanese. 3) use translated names, where a lot are missing, and then it falls back to the original characters.

openstreetmap.de (my local variant) correctly transliterates even the smallest region names in Japan.

In the end, I used Google Maps to navigate during my vacation, and everything just worked.