Press the function button once or twice.
or
Select Navi in the main function bar by sliding and turning the COMAND controller and press to confirm.
In both cases, you will see the map either with or without the menu shown.

Map showing the menu; route guidance inactive

1 Current vehicle position

Map without the menu; route guidance inactive

1 Current vehicle position
2 Map orientation selected
3 Map scale selected

"Route guidance active" means that you have entered a destination and that COMAND has calculated the route. The display then shows the route, changes of direction and lane recommendations. Navigation announcements guide you to your destination.

"Route guidance inactive" means that no destination has been entered and that no route has been calculated.