Device and method for visual technical support of manual order-picking processes through device with at least one (mobile) unit having optical sensing detection device, optical display device, data processing device and wireless data interface to data-processing system having product management software and connection device for active units. Each unit cyclically receives navigation information to produce directions on optical display device. Data for specific navigation results from comparing data from respective optical sensing detection device with stored reference/model data and position of current target of route-optimized list of goods transmitted to unit. Data for specific navigation is cyclically determined and transmitted to assigned unit and new navigation information for a next target on list does not occur until after optical detection of current target/placeholder replacement object by detection device, identification of detected object by the data processing device, and detection and logging of goods from storage location to target location.