Navigational situation display with cylindrically shaped film

Claim 1

A VEHICLE BORNE INSTRUMENT FOR CONTINUOUS PRESENTATION OF A FILM RECORDED GEOGRAPHIC ENVIRONMENT AND OTHER DATA IN ACCORDANCE WITH TRAVEL OF SAID VEHICLE, COMPRISING THE COMBINATION OF: A TRANSLUCENT, REAR-ILLUMINATED PROJECTION SCREEN; FILM HOLDING AND TRANSPORT MEANS ADAPTED TO HOLD AND FORM AND FILM SUBSTANTIALLY INTO A CYLINDRICAL SHAPE THEREBY TO FORM A CYLINDRICAL SURFACE OF FILM, SAID FILM HOLDING AND TRANSPORT MEANS BEING ALSO ADAPTED TO INDEPENDENTLY ROTATE AND TRANSLATE AXIALLY SAID CYLINDRICAL SURFACE; ILLUMINATING MEANS SITUATED OUTSIDE OF AND AT AP REDETERMINED LOCATION WITH RESPECT TO THE SURFACE OF SAID CYLINDRICAL DRUM, SAID ILLUMINATING MEANS BEING ADAPTED TO PASS LIGHT THROUGH A PREDETERMINED AREA OF SAID FILM; AN OPTICAL PROJECTION SYSTEM LOCATED SUBSTANTIALLY INSIDE SAID CYLINDRICAL SURFACE IN A MANNER SO AS TO ACCEPT SAID LIGHT PASSED THROUGH SAID FILM AND THEREAFTER PROJECT SAID LIGHT THROUGH THE INTERIOR OF SAID CYLINDRICAL SURFACE ONTO THE BACK OF SAID SCREEN; FIRST SERVO MEANS RESPONSIVE TO A FIRST INPUT SIGNAL FOR EFFECTING ROTATION OF SAID CYLINDRICAL SURFACE IN ACCORDANCE WITH A CHARACTERISTIC OF SAID FIRST INPUT SIGNAL; AND SECOND SERVO MEANS RESPONSIVE TO A SECOND INPUT SIGNAL FOR EFFECTING AXIAL TRANSLATION OF SAID CYLINDRICAL SURFACE IN ACCORDANCE WITH A CHARACTERISTIC OF SAID SECOND INPUT SIGNAL.