a method and apparatus for stabilizing relatively high - dynamics devices mounted on a low - dynamics support such as a tank . movement of the low - dynamics support is determined by means of an inertial central sensor block that may comprise a strapdown set of gyros or gyros and accelerometers . stabilization is achieved by a two - step process in which the individual high - dynamics devices are stabilized with respect to the support by means of large bandwidth control loops . the much slower support movement is applied to a superposed loop of appropriately smaller band - width . compensation thereby takes place by specifying a reference value for the control loops of the higher - dynamics devices .