The cardinal point on the mariner's compass90= clockwise from due north and directly opposite west.
The cardinal point on the mariner's compass90= clockwise from due north and directly opposite west.
东方航海罗盘上一个基本方位，正北方向顺时钟转90°或指正西的相反方向
The cardinal point on the mariner's compass90= clockwise from due north and directly opposite west.
东方航海罗盘上一个基本方位，正北方向顺时钟转90°或指正西的相反方向