Function of the head-up display
The head-up display projects information from the navigation system, the driver assistance system and some warning messages above the cockpit into the driver's field of vision.
Display elements
When you receive a call, the 
Incoming call message appears in 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
In extreme sunlight, sections of the display may be faded. This can be corrected by switching the head-up display off and on again.