As it happens this could be a cheap engine compartment monitor! Switch it through the engine compartment lights and check water levels, fire danger etc.
the reversing cameras are ok, but its really hard to judge actual distance with them (the fish eye lense of the one i used once gave an odd perspective - they may be better now).
not available on UK Touaregs when I had mine, but there is a continental version, which is linked into steering, and shows lines on the screen, where the car will end up.
We had a new Touareg in our workshop last week as you said turn the wheel and the two green lines on the display show where the car is going to end up , the lines showed that it would miss the workshop door but I can confirm that it did in fact not go through the door it hit it.