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

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

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

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

According to the relevant regulation, lifeboat should be powered by（）.

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

（）is on the panel of radar.

Before any loading takes place any signs of the previous cargo should do（）.

Which of the following is not an operation mode of AIS?（）

What is a CORRECT reply to a pilot’s request, How’s your heading?（）