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

The company should establish and maintain procedures to control all documents and date which are relevant to（）.

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

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

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

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

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

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

The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.

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