（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.

Manoeuvring information can not be obtained from（）.

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

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

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

Which of the following is not a form of precipitation?（）

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

（）is on the panel of radar.

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

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