The helm command PORT TWENTY means（）.

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

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

Manoeuvring information can not be obtained from（）.

The company should establish and maintain procedures to control all documents and date which are relevant to（）.

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

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

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

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

The ISM code is part of（）.