The HUD provides augmented reality (AR) content. When navigating, for example, animated turn-off arrows ("fishbones") are virtually and precisely projected onto the road lane.

The new 3D navigation also shows surroundings, including buildings, time of day, and weather conditions. Mercedes says this will help drivers make better decisions and see where they’re headed ...

The current iteration of MBUX does have AR navigation as an option, and you can add a HUD, but the two systems aren't in fact integrated.