Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.

A tide is called diurnal when（）.

The helm command PORT TWENTY means（）.

Berthing means bringing a vessel to her berth until（）.

（）is the act of allocating space to containers on board of a container ship in the order of the discharge ports.

（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.

In the Northern hemisphere northerly winds may cause temperature（）.

The loading of the ship must be done in accordance with（）.

Which of the following is not a form of precipitation?（）

Full details of all lights and fog signals are shown on（）.