A medical marker (12) device for detection by a navigation system in a navigated medical procedure, comprising: a) an image-detectable two-dimensional marker pattern (13) for detection by an imaging unit of the navigation system； b) a carrier part (14) for carrying the marker pattern (13)； c) a positioning part (15) for positioning the marker device (12) on an anatomical structure (11)； and d) a support part (16) for supporting the carrier part (14) and the positioning part (15).
