In a GPS composite navigation apparatus of a configuration having a GPS receiver, variation in an estimated position, an estimated velocity, and an estimated azimuth of a moving body when the moving body is not moving is resolved, and the GPSINS integrated navigation system with good response characteristics from a stationary state to a moving state. The substrate has a peripheral edge, an end wall and a side wall. The reproducing apparatus reproduces the data from the magneto-optical record medium. In order to prevent this, according to the invention pressure equalization openings are embodied or arranged with respect to the gap in such a way that a reduced pressure is introduced into the chambers in the interior of the valve, so that the closing-operative force is distinctly reduced. According to the invention, the moving parts of the locking device execute purely rotational motions and preferably the locking element formed as a locking shaft is provided over a section formed as a cam.