A system for displaying information regarding a common axis in a subject, comprising: a navigation system having a tracking system configured to determine a location of an instrument relative to at least a first portion of a subject and a second portion of the subject different from the first portion along the common axis; a navigation processor configured to execute instructions to determine the location of the instrument for illustrating with a display device a representation of the instrument in both of a first direction along the common axis extending through the first portion of the subject and a second direction along the common axis extending through the second portion of the subject; imaging means for providing a first image of the first portion of the subject and a second image of the second portion of the subject which are operable to be displayed along the common axis extending through the first portion and the second portion of the subject; and wherein the first image of the first portion of the subject and the second image of the second portion of the subject are of the respective first portion and second portion at a respective selected distance along the single common axis away from the instrument; wherein the first image is of the first portion of the subject and the second image is of the second portion of the subject along the single common axis; the system further comprising: a display device configured to display simultaneously both (i) the first image and the representation of the instrument in the first direction and (ii) the second image and the representation of the instrument in the second direction along the common axis, wherein the first direction is opposite the second direction along the common axis. a navigation system having a tracking system configured to determine a location of an instrument relative to at least a first portion of a subject and a second portion of the subject different from the first portion along the common axis; a navigation processor configured to execute instructions to determine the location of the instrument for illustrating with a display device a representation of the instrument in both of a first direction along the common axis extending through the first portion of the subject and a second direction along the common axis extending through the second portion of the subject; imaging means for providing a first image of the first portion of the subject and a second image of the second portion of the subject which are operable to be displayed along the common axis extending through the first portion and the second portion of the subject; and wherein the first image of the first portion of the subject and the second image of the second portion of the subject are of the respective first portion and second portion at a respective selected distance along the single common axis away from the instrument; wherein the first image is of the first portion of the subject and the second image is of the second portion of the subject along the single common axis; the system further comprising: a display device configured to display simultaneously both (i) the first image and the representation of the instrument in the first direction and (ii) the second image and the representation of the instrument in the second direction along the common axis, wherein the first direction is opposite the second direction along the common axis. <EOS>