A method is provided for automatically determining a suitable angulation or inclination of a recording system during a navigation of a guide wire through a vascular system of a patient from a vessel into a branch of the vessel. The method includes recording a sequence of live X-ray images of the guide wire and presenting the X-ray images on a display unit. A first virtual tangent is applied to a first section of the guide wire, and a second virtual tangent is applied to a second section of the guide wire on the X-ray images. A point of intersection of the virtual tangents is determined on the X-ray images, and a triangle is determined. An area of the triangle is determined, and the suitable angulation or inclination of the recording system is determined by maximizing the area of the triangle by movement of the recording system.
