Where would you find information about the time of high tide at a specific location on a particular day of the year?（）

The helm command PORT TWENTY means（）.

When steering by autopilot,how often should the steering be checked?（）

How long are you prohibited to consume alcohol prior to serving as a member of a watch?（）

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

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

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

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

It is dangerous for vessels without the operational radar（）the estuary.

Bales close to the deckhead should be covered to prevent（）.