A navigation system (406) comprising:a reference (428, 438) adapted to be disposed on a patient (P)；an image capturing device (402) configured to image a patient having a reference (428, 438)；a surgical device (424)；a tracking system (436； 426, 420, 422) configured to generate location data describing a location of the surgical device relative to the reference；a controller (408) configured to receive the image the location data and to correlate the position of the surgical device with the image； anda display (410) configured to display the image and a virtual image of the surgical device based on the correlated position of the surgical device with the image.
