Pictorial display navigation equipment

Claim 1

A PICTORIAL ILLUSTRATION DEVICE FOR USE IN A MOVING VEHICLE AND ADAPTED TO RECEIVE SIGNALS TRANSMITTED BY A REFERENCE STATION ON TERRAIN TO BE TRANSVERSED BY THE VEHICLE AND REPRESENTING THE BEARING AND RANGE OF THE VEHICLE FROM SAID REFERENCE STATION, SAID DEVICE COMPRISING A SCREEN INCLUDING MEANS FOR INDICATING A VEHICLE THEREON, A SLIDE ELEMENT IN THE DEVICE AND HELD IN A FIXED POSITION TO PROVIDE A MAP IMAGE OF THE TERRAIN AND THE STATION, MEANS FOR DIRECTING A LIGHT BEAM ALONG AN AXIS THROUGH THE MAP IMAGE FOR PRESENTING THE MAP IMAGE FROM THE SLIDE ELEMENT ONTO SAID SCREEN, A POSITIONING LENS INTERPOSED BETWEEN SAID SCREEN AND THE MAP IMAGE SUBSTANTIALLY ALONG THE AXIS OF SAID LAST MENTIONED MEANS, MEANS FOR DISPLACING SAID LENS LINEARLY IN POLAR COORDINATES RELATIVE TO SAID SCREEN, IN RESPONSE TO RANGE SIGNALS, MEANS TO ROTATE SAID SCREEN IN RESPONSE TO THE MANEUVERS OF THE MOVING VEHICLE TO THEREBY ALIGN THE VEHICLE INDICATING MEANS WITH THE DIRECTION OF MOVEMENT OF THE VEHICLE, MEANS FOR ARCUATELY DISPLACING SAID LENS IN RESPONSE TO BEARING SIGNALS SIMULTANEOUSLY WHEN SAID LENS IS DISPLACED FROM THE AXIS OF THE LIGHT BEAM, WHEREBY CORRESPONDING RECTILINEAR MOVEMENT OF THE MAP IMAGE PROJECTED ON SAID SCREEN WITH RESPECT TO SAID VEHICLE INDICATING MEANS SO AS TO PROVIDE AN INDICATION OF THE POSITION OF THE VEHICLE RELATIVE TO THE TERRAIN.