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

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

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

Which wind results from a land mass cooling more quickly at night than an adjacent water area?（）

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

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

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

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

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

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