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

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

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

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

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

The dew point temperature is（）.

（）is on the panel of radar.

Manoeuvring information can not be obtained from（）.

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

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