1. An image output method for medical navigation in which the positional relationship of an instrument with respect to a part of a patient's body is ascertained, and in which the instrument and the part of the patient's body are displayed in the correct positional relationship on an image output, wherein the display of the part of the patient's body is based on the one hand on virtual image data captured by means of a medical imaging method and on the other hand on actual images captured during navigation, wherein the virtual image data is displayed on the image output primarily and as the basis of the image, and the actual images are superimposed on them merely as an addition and secondarily.