The hydrodynamic coefficients of ship's vertical motion change a lot in different sea environment and ship sailing condition.
不同的航速、海情以及不同的航行方向使得船舶横向运动的水动力参数模型发生很大的变化。
It also thinks that the proper and effective operation of the main engine must fit with the astern condition, ensure safety in sailing.
文章认为只有依据船舶实时倒航工况方能做到主机操作的及时与正确，保证航行安全。
Tested steering gear before sailing , condition normal.
（航海日志）开航前实验操舵设备，情况正常。
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