Abstract: A missile launcher system includes a launching tube and a tracker for tracking a target and for adjusting a flight path of the missile while in flight such that it will hit the target. The tracker includes an optical channel (12) having an optical aiming marking (e.g. cross hairs) and control means to adjust the missile flight path in response to aiming of the optical aiming marking. The invention provides for conversion of the missile launcher system by projecting the optical aiming marking via a video camera (16) conveniently by means of a retro reflector (18) on a monitor, generating and adjusting an electronic aiming marking to coincide with the optical aiming marking and connecting the video camera to the optical channel. Remote controlling the video camera to aim at the target in accordance with images on the monitor thus aims the optical channel appropriately and thus causes the control means to control the missile appropriately to hit the target.