Position locator for airplanes and the like

Claim 1

A POSITION LOCATOR FOR LOCATING THE POSITION OF AN AIRPLANE AND THE LIKE ON NAVIGATIONAL CHARTS AND MAPS FROM READING INDICATED ON ADF AND/OR OMNI INSTRUMENTS AND BY THE COMPASS CARRIED BY THE AIRPLANE AND THE LIKE, SAID POSITION LOCATOR COMPRISING A TRANSPARENT BASE PLATE HAVING A BASE PLATE AZIMUTH SCALE READING FROM ZERO DEGREES TO 360 DEGREES AND HAVING A CENTER LINE EXTENDING LONGITUDINALLY OF SAID BASE PLATE IN ALIGNMENT WITH THE ZERO LINE OF SAID BASE PLATE AZIMUTH SCALE AND HAVING AN ARROW THEREON POINTING OUTWARDLY FROM THE ZERO LINE, A TRANSPARENT DISC HAVING A DISC AZIMUTH SCALE READING FROM ZERO DEGREES TO 360 DEGREES, SAID DISC AZIMUTH SCALE BEING SUBDIVIDED INTO AN INNER SCALE AND AN OUTER SCALE, AN ELONGATED TRANSPARENT POINTER HAVING AN INDEX LINE THEREON; MEANS HAVING A BORE THERETHROUGH ROTATABLY MOUNTING SAID DISC AND SAID POINTER ON TOP OF SAID BASE PLATE FOR 360 DEGREE ROTATION OF SAID DISC AND SAID POINTER, RESPECTIVELY, RELATIVE TO SAID BASE PLATE WITH THE CENTER OF THE BORE COINCIDING WITH THE CENTERS OF SAID BASE PLATE AZIMUTHE SCALE AND SAID DISC AZIMUTH SCALE, WITH SAID INDEX LINE, IF EXTENDED, INTERSECTING THE CENTER OF THE BORE, AND WITH SAID INNER SCALE BEING ADJACENT SAID BASE PLATE AZIMUTH SCALE, SAID DISC AND SAID POINTER BEING SUPPORTED BY SAID BASE PLATE WITH SAID BASE PLATE BEING ADAPTED TO REST ON NAVIGATIONAL CHARTS AND MAPS WHEREBY SAID DISC AND SAID POINTER ARE ROTATABLE RELATIVE TO THE NAVIGATIONAL CHARTS AND MAPS; SAID BASE PLATE HAVING A DISTANCE SCALE THEREON WITH THE ZERO POINT THEREOF BEING OPPOSITE THE CENTER OF SAID BORE AND INCREASING IN READINGS IN OPPOSITE DIRECTIONS THEREFROM, A RULER AND A PAIR OF ARMS OF EQUAL LENGHT PIVOTALLY CONNECTED ADJACENT OPPOSITELY ENDS THEREOF RESPECTIVELY TO SAID RULER AND SAID BASE PLATE WHEREBY SAID RULER IS ADAPTED TO BE MOVED IN PARALLEL RELATIONSHIP TO SAID BASE PLATE.