Navigation devices for vehicles, methods for producing data for searches, and methods for searching for guided routes are disclosed. Generally, a name of a first street is received, a search for second streets which are connected to an end point of the first street directly or via road links is performed, the second streets are displayed, a selection is received of one of the displayed second streets, and a branch point or an area at which the first street and the selected second street are connected with each other is stored as data for a search relating to the first street.