cardinal marks
... cardinal marks of buoyage system A 浮筒系统A方位标志 cardinal marks 方位标方位标志 Cardinal Marks 方位标志 ...
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临近方位标度盘有一个方向标志，需要对着方位标度盘外部边缘来读取所指示的选定航向。
Selected heading. A heading marker, located adjacent to and read against the outer edge of the azimuth dial, indicates the selected heading.
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