A navigation system comprising: a tracking device including: a base attachable to an object (F); a tracking element ; a connector coupling said tracking element to said base to allow movement of said tracking element in at least one degree of freedom relative to said base to place said tracking element in a desired orientation; and an orientation sensor to determine if said tracking element is in the desired orientation, wherein said orientation sensor is further defined as a gravity sensor configured to measure gravity components along three axes; a camera unit having at least one sensor capable of tracking said tracking element ; a display ; and a computing system configured to determine if said tracking element is in the desired orientation and to instruct a user to move said tracking element relative to said base in said at least one degree of freedom if said tracking element is not in the desired orientation based on the gravity measurement from the orientation sensor ; wherein said computing system is further configured to display instructions on said display by graphically representing a current orientation of the tracking element on said display , by dynamically adjusting the graphical representation on said display as the user moves said tracking element , and by graphically representing the desired orientation on said display so that the user can visually determine how close the current orientation is to the desired orientation, wherein said tracking element is capable of generating a line-of-sight tracking signal, and wherein, in response to said tracking element being in said desired orientation, a line-of-sight relationship is established between said tracking element and said at least one sensor of said camera unit . a tracking device including: a base attachable to an object (F); a tracking element ; a connector coupling said tracking element to said base to allow movement of said tracking element in at least one degree of freedom relative to said base to place said tracking element in a desired orientation; and an orientation sensor to determine if said tracking element is in the desired orientation, wherein said orientation sensor is further defined as a gravity sensor configured to measure gravity components along three axes; a camera unit having at least one sensor capable of tracking said tracking element ; a display ; and a computing system configured to determine if said tracking element is in the desired orientation and to instruct a user to move said tracking element relative to said base in said at least one degree of freedom if said tracking element is not in the desired orientation based on the gravity measurement from the orientation sensor ; wherein said computing system is further configured to display instructions on said display by graphically representing a current orientation of the tracking element on said display , by dynamically adjusting the graphical representation on said display as the user moves said tracking element , and by graphically representing the desired orientation on said display so that the user can visually determine how close the current orientation is to the desired orientation, wherein said tracking element is capable of generating a line-of-sight tracking signal, and wherein, in response to said tracking element being in said desired orientation, a line-of-sight relationship is established between said tracking element and said at least one sensor of said camera unit . <EOS>