Method and device to enter by speech an address of destination in a navigation system in real time

The invention relates to a method for speech input of a Destination in a navigation system in real time, at which input speech utterances of a user by means recognized a voice recognition device, and according to their probability of detection are classified and that Utterance with the greatest recognition probability as the entered voice statement is identified, at least an utterance is an admissible speech command, which comprises this voice command associated operating functions the route guidance system is activated, all permissible Utterances stored on at least one database are. According to the invention comprises at least one operating function of Route guidance system at least an input dialog, and after activation of at least one operating function of the guidance system, depending on the at least one input dialogue from the stored at least one data base permissible speech utterances in real time at least one lexicon generated and then the at least one lexicon as vocabulary is loaded into the speech recognition device.