The cardinal point on the mariner's compass270= clockwise from due north and directly opposite east.
The cardinal point on the mariner's compass270= clockwise from due north and directly opposite east.
西航海者指南针上的基本方向，即从正北按顺时针方向转270度，正对着东方
The cardinal point on the mariner's compass270= clockwise from due north and directly opposite east.
西航海者指南针上的基本方向，即从正北按顺时针方向转270度，正对着东方