The invention relates to a medical tracking marker (12) for localizing or tracking an object (10) by means of a medical tracking system (30), said marker comprising a first part (1) which is to be fixed on the object (10), and a second part (2) which is to be connected to the first part (1), wherein the first and second parts (1, 2) comprise interconnecting elements (4, 6) which are adapted to provide a positionaiiy determined connection between the first part (1 ) and the second part (2) while the first part is located under a surgical drape (20) and the second part is located above said surgical drape (20), with the drape (20) placed between the two parts (1, 2). The invention also relates to a method of referencing an object (10) using a medical navigation system, wherein a medical tracking marker such as has been described above is localized or tracked by means of a medical tracking system (30), and wherein the object is registered by means of the first part (1) of the marker (12) in a preliminary referencing step, in particular for imaging purposes, which is later adapted to form a final referencing step for navigation using the second part (2) which has been placed on the first part in a positionaiiy defined, pre-determined manner.La présente invention concerne un marqueur de poursuite médicale (12) permettant de localiser ou de suivre un objet (10) au moyen dun système de poursuite médicale (30), ledit marqueur comprenant une première partie (1), qui doit être fixée sur lobjet (10), et une seconde partie, (2) qui doit être reliée à la première partie (1), lesdites première et seconde parties (1, 2) comprenant des éléments dinterconnexion (4, 6), conçus pour connecter, dans une position prédéterminée, les première (1) et seconde parties (2). La première partie est située sous un champ opératoire (20), tandis que la seconde partie est située au-dessus dudit champ opératoire (20), ledit champ opératoire (20) étant donc placé entre les deux parties (1, 2). Linven
