If I remember correctly have seen some navigator in the past to have speed auto zoom away from maneuvers (e.g. > 2 km) and distance auto zoom when be near (e.g. < 2 km).
So can be more complicated ideas and combinations. 
If I remember correctly have seen some navigator in the past to have speed auto zoom away from maneuvers (e.g. > 2 km) and distance auto zoom when be near (e.g. < 2 km).
So can be more complicated ideas and combinations.