The surgical navigation system comprises: a surgical tool designed to perform a surgical process and including a set of markers visible in medical images and having known spatial relationships between them a receiving circuitry adapted to receive a given medical image, which given medical image includes the surgical tool and an organ of a subject and an image processing circuitry adapted to identify said markers in the given medical image, to determine a location and orientation of the surgical tool based on the location of the identified markers in the image and to generate and render an overlay on the image derived from the determined location and orientation.
