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

Before any loading takes place any signs of the previous cargo should do（）.

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

Shipboard Emergency Drills must be carried out at least（）on board cargo ship.

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

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

The helm command PORT TWENTY means（）.

The loading of the ship must be done in accordance with（）.

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

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