The invention relates to a method for displaying the position and orientation of a linear instrument (1) navigated with respect to a 3D medical image (V), wherein:said linear instrument (1) is coupled to a guide (2)；the guide (2) is tracked by a navigation system with respect to the 3D image (V)；a plane (4) containing the axis of the linear instrument (1) is virtually attached to the guide (2)；a slice reformatted in the 3D image and containing said plane (4) is displayed.Another object of the invention is a system for carrying out said method.
