Function of the head-up display
The head-up display projects information from the navigation system and the driver assistance system above the cockpit into the driver's field of vision.
Mercedes-AMG display content
Depending on the vehicle's equipment, you can select further AMG displays in addition to the standard displays on the Display content menu. If you select RACETIMER, the head-up display will show the lap and lap time.
When you receive a call, the 
Incoming call - message will appear on the head-up display.
System limits
The visibility is influenced by the following conditions:
seat position
the positioning of the display image
light conditions
wet road surfaces
objects on the display cover
polarisation in sunglasses