The map is only shown with 12" driver display.
The driver can choose to have navigation information in the driver display even if there is no itinerary activated. With an activated itinerary, the map is shown automatically in the driver display.
Map display in the driver display is activated/deactivated here.
(Settings > My car > Displays > Driver display centre area > Driver display options)
- There highlight the option Show Navigation(Show navigation even if no route is set).