 For sustained fire, the normal procedure is to use "through-loading" from external ammunition supplies.The indirect-fire periscopic sight is fitted with an electronic tilt compensator that records the tilt of the vehicle by means of sensors and converts this directly into correction signals which are automatically applied to elevation and azimuth as displayed in the layer's display unit.The eyepiece of the periscope sight is mounted in such a way that both the layer and crew chief can view in turn, thus giving the crew chief a means of checking the layer.