单项选择题

With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.

A.Call sign and IMO number
B.Course over ground and MMSI
C.MMSI number and call sign
D.Route Plan and navigational status

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While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position（）.

A.A decreasing reading on loran pair 9960-X
B.The bearing of Wolf Trap Light changing to the right
C.Increasing soundings
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Which statement concerning GPS is TRUE（）.

A.It cannot be used in all parts of the world
B.There are 12 functioning GPS satellites at present
C.It may be suspended without warning
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Which one of the followings does not limit the effective range of radar（）.

A.Pulse width
B.Pulse repetition frequency
C.Peak power
D.Target brightness