单项选择题

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

A.Rate of turn
B.Latitude and longitude
C.Navigational status
D.All of the above

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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

单项选择题

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
D.The bearing of Wolf Trap Light changing to the left

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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
D.Two position lines are used to give a 2D fix