单项选择题

Which of the following statements is TRUE regarding automatic identification systems (AIS) ?（）

A.The master may，at his/her discretion，turn off the AIS if he/she believes that it may compromise the safety or security of the vessel
B.Under no circumstances shall AIS be turned off while underway as this could endanger the vessel and those around her
C.AIS is always required to be operating if the vessel is in or in the vicinity of a VTS area
D.AIS is always required to be operating if the vessel is within 100 nautical miles of the coastline

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单项选择题

Which of the following statements is TRUE regarding automatic identification systems (AIS)? （）

A.AIS is a short-range VHF-FM system that automatically broadcasts a vessel's position，course，speed and other safety related information to all those with similar equipment in the area
B.AIS is a one-way centrally managed system that requires the local VTS to send commands to instruct each vessel to broadcast position，course，speed and other safety related information to all those with similar equipment in the area
C.AIS is a global tracking system that relies upon INMARSAT C service to communicate vessel position，course，speed and other safety related information to all those with similar equipment in the area
D.AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position，course，speed and other safety related information to all those with similar equipment within the area

单项选择题

Which information must automatic identification systems (AIS) automatically provide to appropriately equipped shore stations，vessels and aircraft? （）

A.Vessel's type
B.Vessel's course
C.Navigational status
D.All of the above

单项选择题

When should the emergency position-indicating radiobeacon be activated after abandoning a ship?（）

A.Immediately
B.After one hour
C.Only when another vessel is in sight
D.Only after sunset