Vision systems having knowledge of position and attitude can reliably determine what scenes are being addressed by the system. Real images of the scene can then be augmented with computer generated information which relates to the known scene. Since the level of detail or resolution is not restricted in computer generated models, a system can continue to provide further magnified images without limit. As magnification increases, the amount of information presented to a user from images of the real scene decreases but computer generated imagery continues to provides realistic images which represent scenes being addressed by the apparatus. Computer generated imagery is combined with an image of a real scene to form an augmented image which is presented to the user aligned to the viewing direction of the device at any desired magnification.