Poppyelizabeth

We have a 2001 E39M5. The language displayed on the screen is in English, but when we try to do navigation, it's speaking to us in German. We have gone to settings and tried to change the language. The options are "USA" and "E" which changes the dashboard language to Spanish. Does anyone know why the "USA" option lets us read on English but talks to us in German, and is there anyway to change it? Thank you