Method for operating an operating device for a transportation vehicle to assist a driver when coupling the transportation vehicle to a trailer, operating device, and transportation vehicle

A transportation vehicle comprising:

• a control device with a computing apparatus, wherein the control device assist assists a driver maneuvering the transportation vehicle relative to a trailer to couple the transportation vehicle to the trailer,
• wherein target coordinates of a coupling position provided for the transportation vehicle for coupling are determined and repeated by the control device while a graphical distance display element is displayed to the driver by a display apparatus of the transportation vehicle, a current distance value of a distance of the transportation vehicle from the coupling position is determined, and a predetermined size parameter of the graphical distance display element is adjusted based on the current distance value,
• wherein a non-linear scaling function is used for a conversion from the determined current distance value into a value of the size parameter that is to be set, and
• wherein the non-linear scaling function used at least in a predetermined region around the coupling position provides a position resolution that is higher than the position resolution provided outside the region around the coupling position.