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
相关考题
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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 -
单项选择题
When may the automatic identification system (AIS) be switched off? （）
A.At anytime as long as it is properly logged
B.At the Master's professional judgment
C.Only when the vessel is at anchor or in port
D.Under no circumstance
