An embodiment of an optoelectronic apparatus for assisting an operator in determining the shooting attitude to give to a hand-held grenade launcher so as to strike a moving target including an electronic processing unit configured so as to: measure the pitch angle and the heading angle of the grenade launcher and the distance of the target when the grenade launcher is moved by the operator during the pointing of the moving target, determine position data indicative of the positions of the moving target, determine a future impact time of the grenade on the target on the basis of position data and of data indicative of the ballistics of the grenade, determine a shooting attitude of the target on the basis of the impact time, measure the pitch angle and heading angle indicating the attitude imparted to the grenade launcher by the operator, compute a pitch difference between the shooting pitch angle and the pitch angle measured and a heading difference between the shooting heading angle and the heading angle measured, communicate to the operator the variation of pitch and/or heading to be given to the grenade launcher so that the pitch and/or heading difference is zero.