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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单项选择题

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

单项选择题

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