Method for operating a start-stop device of a motor vehicle, and motor vehicle

Method for operating a start-stop device (10) of a motor vehicle (4) which upon the occurrence of an operating data of the motor vehicle (4) evaluating stopping criterion off a drive motor (9) of the motor vehicle (4) and the occurrence of a start criterion to the drive motor (9 ) re-enabled, in which (during operation of the motor vehicle 4) in addition, the stance phase evaluates in a navigation environment according to one at least one stance phase of a predetermined or predicted stance phase duration descriptive target trajectory the stopping criterion at the beginning of stance phase associated stance phase duration.