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单选题
Your radar is set on a true motion display.Which of the following will NOT appear to move across the PPI scope（）.
A
Echoes from a buoy
B
Own ship's marker
C
Echo from a ship on the same course at the same speed
D
Echo from a ship on a reciprocal course at the same speed
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单选题The closest point of approach (CPA) of a contact on a relative motion radar may be determined（）.A
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单选题A radar contact will remain stationary on a relative motion radar display only when it is（）.A
on the same course as your vesselB
at the same speed as your vesselC
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The use of a radar excuses a vessel from the need of a look-outC
The radar equipment is only required to be used in restricted visibilityD
The safe speed of such a vessel will likely be greater than that of vessels without radar
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