Abstract: A situation display system has a movable section for attachment to a helmet nd a stationary section, including a stationary map providing a real map background for showing situation display elements on the map. The movable section is connected through a flexible cable to a device for the remote control of the situation display elements which are computer generated. By accurate measurements of the location of the helmet and its distance to the map, signals are provided which are processed independently of any movements of an operator wearing the helmet so that the elements are correctly displayed and seen on the map. Thus, a tactical situation display is obtained for a military command system.

Abstract: Optical informations or data are transmitted by an essentially stationary transmitter and received by a mobile receiver attached to an operator's helmet or headset. A receiving lens and an optical wave guide lead to the operator's eye for the receiver. The optical transmitter is embodied as a projector arranged to be tiltable about its vertical axis and about a horizontal axis extending perpendicularly to the projected light beam direction. The projector further includes a tracking guide sensor and the receiver includes a reflector for establishing an optical guidance coupling between the projector and the receiver so that the projector may be appropriately pivoted to track the moving receiver.