An endovascular delivery system includes an endovascular prosthetic device (302) and a signal active guide wire (402) engaging the endovascular prosthetic device. A rotary encoder (704) is coupled with the guide wire and the endovascular prosthetic device to provide an encoder signal of the guide wire. The encoder signal is indicative of axial angular position of the endovascular prosthetic device (302) during implantation of the prosthetic device in a body of a patient.