A method is disclosed for marking out a guide line of a penetration instrument entering an object along a penetration channel. In at least one embodiment, the penetration channel into the object is firstly determined based on image data of the object generated by an imaging recording system, the penetration channel being defined by a penetration point into the object and at least one penetration direction. Then, at least two light fan beams are emitted from different directions in such a fashion that the line of intersection of the fan beams is coaxial with the penetration direction. A marking out apparatus is further disclosed for carrying out the method, along with a control device suitable to this end, and an imaging recording system including such a marking out apparatus.
