Course protractor

Claim 1

A COURSE PROTRACTOR, COMPRISING: A FIRST INDICATOR MEMBER, HAVING A NORTH-SOUTH INDICATOR, AND CARRYING A VARIATION SCALE HAVING ITS ZEROMARK ON SAID NORTH-SOUTH INDICATOR, AND INCLUDING AN EAST-VARIATION SCALE EXTENDING RIGHTWARDLY FROM SAID ZERO-MARK AND A WEST-VARIATION SCALE EXTENDING LEFTWARDLY THEREFROM, AND PROVIDED WITH AN APERTURE; A SECOND INDICATOR MEMBER, BEING AN ARM-MEMBER CARRYING A COURSE-HEADING SCALE AND A CHART-COURSE LINE, SAID COURSE-HEADING SCALE AND A CHART-COURSE POINT IN LINE WITH SAID CHART-COURSE LINE AND RUNNING COUNTER-CLOCKWISE, THE SAID SECOND MEMBER BEING PROVIDED WITH AN APERTURE AROUND WHICH SAID SCALE IS CONCENTRIC AND TOWARD WHICH SAID CHART-COURSE LINE IS DIRECTED; A THIRD INDICATOR MEMBER, CARRYING A CORRECTED-COURSE DESIGNATOR LINE AND CARRYING ALSO A DEVIATION SCALE BEGINNING AT A ZERO POINT IN LINE WITH SAID CORRECTEDCOURSE DESIGNATOR LINE, INCLUDING AN EAST-DEVIATION INDICATOR DIRECTING MOVEMENT OF SAID THIRD MEMBER CLOCKWISE FOR EAST-DEVIATION AND A WEST-DEVIATION INDICATOR DIRECTING MOVEMENT OF SAID THIRD MEMBER COUNTER-CLOCKWISE FOR WEST-DEVIATION, THE SAID THIRD MEMBER BEING PROVIDED WITH AN APERTURE TOWARD WHICH SAID CORRECTED-COURSE DESIGNATOR LINE IS DIRECTED; AND MEANS EXTENDING THROUGH SAID APERTURES ROTATABLY INTERCONNECTING THE SAID THREE INDICATOR MEMBERS, SAID MEANS PROVIDED WITH A HOLLOW BORE; THE SAID FIRST INDICATOR MEMBER BEING FORMED TO PROVIDE SUBSTANTIAL TRANSPARENT AREAS FACILITATING POSITIONING OF THE DEVICE AT A SPECIFIC LOCATION ON AN ASSOCIATED CHART, AND THE SAID SECOND AND THIRD INDICATOR MEMBERS BEING FORMED TO PROVIDE SUBSTANTIAL TRANSPARENT AREAS AT LEAST IN THE REGION OF THE SAID SCALES, AND ALL OF THE SAID SCALES BEING OPERATIVELY ADJACENT AND CONCENTRICALLY ARRANGED WITH EACH OTHER AND WITH THE INDICATOR-MEMBERS-CONNECTING MEANS, PROVIDING THAT THE SCALES ARE CO-OPERATIVELY USABLE.