Apparatus for indicating relative azimuth

An arrangement for indicating a relative azimuth between two objects remote from each other, such as a control station having therein a first detector for detecting a true azimuth thereof and a mobile unit remotely controlled by the control station which has therein a second detector for detecting a true azimuth thereof, comprising:

• a first synchronous transmitter mounted on the control station for generating and transmitting a signal corresponding to the true azimuth of the control station detected by said first azimuth detector;
• a second synchronous transmitter mounted on the mobile unit for generating and transmitting a signal corresponding to the true azimuth of the mobile unit detected by said second true azimuth detector;
• a frame installed in the control station for protecting and supporting other elements constituting said device;
• a transparent window fitted in front of said frame;
• an outer stationary dial equally graduated and fixedly secured to the frame inside the window and having a mark thereon aligned with the direction of heading of the control station;
• an inner rotatable dial equally graduated and disposed concentrically with said outer stationary dial and including a hollow rotary shaft;
• a rotatable indicator extending to and over said outer stationary dial and having at the intermediate part thereof an arrow shaped member for indicating the graduations of the inner inner dial and having a rotary shaft fixedly secured thereto and inserted concentrically within said hollow rotary shaft of said inner rotatable dial;
• a first synchronous receiver having therein a rotary shaft and means for providing the rotary shaft with rotation by receving the signal transmitted from said first synchronous transmitter mounted on the control station;
• a second synchronous receiver having therein a rotary shaft and means for providing the rotary shaft with rotation by receiving the signal transmitted from said second synchronous transmitter mounted on the mobile unit;
• and
• means for transmitting said rotations of said first and second synchronous receivers to said inner rotatable dial and the rotatable indicator such that the true azimuth of the control station is represented on the graduation of said inner rotatable dial indicated by said mark provided on said outer stationary dial, and that of the mobile unit is represented on the graduation of said inner rotatable dial indicated by said arrow shaped member provided in the intermediate part of said rotatable indicator, and moreover the relative azimuth between the control station and the mobile unit is represented on the graduation of said outer stationary dial indicated by the leading and of said rotatable indicator.