An apparatus for displaying to a user the image of a scene surrounding a vehicle traveling in inertial space in response to rotational and translational acceleration commands by the user in six degrees of freedom, the apparatus comprising:
- a full-field-of-view display for displaying said image of the scene surrounding the vehicle to the user;
- means for producing images on said full-field-of-view display, said images changing to correspond to a new perspective of the user in response to said rotational and translational acceleration commands by the user in six-degrees-of-freedom;
- means for the user to impart said rotational and translational acceleration commands to said image producing means;
- and
- means for superimposing on said image a superimposed figure providing the user an instant reference of rotational orientation wherein said image is free of a ground plane, thereby assisting said user preforming the appropriate navigation in the inertial space.