2010 Mercedes GL-Class Owner's Manual - Page 173

Driving systems G Warning! Red guideline = indicates an approximate distance of 10 in (0.25 m) from the rear of the vehicle. Yellow guidelines ; indicate an approximate distance of 3 ft (1 m) from the rear of the vehicle. Blue guidelines : indicate the approximate width required for the vehicle. 171 Please note that objects which do not touch the ground may appear to be further away than they actually are, for example: Rthe Ra bumper of a vehicle parked behind you back of a truck trailer hitch In such cases, you should not use the guidelines to judge the distance. You may misjudge the distance which increases the risk of impacting the objects. Even when the object you approach is directly on the ground do not approach the object any closer than the red guideline. X Switching off: Shift the automatic transmission into park position P, neutral position N, or drive position D. Z Controls in detail Rthe i The image from the rear view camera will no longer be displayed if you select another function on the COMAND system while reverse gear R is engaged. To display the image again, disengage and reengage reverse gear R.