THIS I have seen indeed, but it’s quite short:
"Navigation has another popular feature: a new dynamic map auto zoom while driving.
Enabled with “Automatic” option in Auto zoom settings and works currently in real time with next turn instruction."
That choosing “automatic zoom level” means “automatically chosen bei Kurviger” - hmm, seems to be self-evident. 
Then the question is - depending from what? DISTANCE to next turn instruction? Category of road? Speed?
And still unclear (for me!): “Fixed auto zoom” - that sounds like a paradoxon: Either zoom is fixed, or it is “auto” (i.e. it is NOT fixed) - and in combination with the option to choose a zoom factor … - perhaps I am not the only one who does not understand instantly? 
IF this would be the explanation:
THEN GOTO above “Then the question is - depending from what? DISTANCE to next turn instruction? Category of road? Speed?” 