The ISM code is part of（）.

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

The mean draft of a ship is the draft（）.

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

The dew point temperature is（）.

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

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

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

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

The helm command PORT TWENTY means（）.