Where does Navigator hide?

Short version:
Where on my Galaxy S9/Android 10 can I find the Navigator files?

Long version:
-yesterday, as usual, I selected a route in Navigator and drove away.
-I always use TTS; yesterday Navigator had replaced the usual (German) voice with a different (Irish) voice.
-Last night, back home, I tried to switch back to the usual voice.
-Navigator did not offer it for selection.
-To be sure the voice file hadn't developed a defect, I deleted it and re-downloaded it from the Play Store.
-Navigator still did not "see" it.
-I performed a local backup in Navigator, Deleted Data, installed the bare necessities, restored the backup - NOT: "no backup".
-I unearthed a USB stick with a (not too old) Navigator backup.
-On the S9, I couldn't find the folder with the Navigator data anywhere - both in RAM and on micro SD the folder Android/data/....Navigator only contained an empty folder "files".
-I had a file manager search all memory for germany_osm* and *mca
-No files found.
-I Deleted Data, uninstalled Navigator, reinstalled from the Play Store, redownloaded the necessary stuff.
-No change - including the voice; Heather TTS is there, Doris TTS is not.
-...and of course I can't restore the backup of my Favourites and Routes.

???????