Which of the following shall not the officers in charge of the navigational watch do?（）

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

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

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

When the wave period and the apparent rolling period are the same（）.

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

Fog is likely to occur when there is little difference between the dew point and the（）.

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

ECDIS must be able to perform all of the following EXCEPT（）.

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