The helm command PORT TWENTY means（）.

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

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

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

Manoeuvring information can not be obtained from（）.

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

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

（）is on the panel of radar.

What is it called when it is possible to ignite the vapour above the oil?（）

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