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

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

The circulation around a low pressure center in the Northern Hemisphere is（）.

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

A tide is called diurnal when（）.

Your vessel is docking, but not yet alongside. Which line will be the most useful when maneuvering the vessel alongside the pier?（）.

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

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

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

How long are you prohibited to consume alcohol prior to serving as a member of a watch?（）