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 buoyB.Own ship's markerC.Echo from a ship on the same course at the same speedD.Echo from a ship on a reciprocal course at the same speed
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（）.Aimmediately when the contact is noted on radarBonly if the radar scope is watched constantlyCafter the contact has been marked at least twiceDby an occasional glance at the radar
单选题A radar contact will remain stationary on a relative motion radar display only when it is（）.Aon the same course as your vesselBat the same speed as your vesselCon the same course and speed as your vesselDon a reciprocal course at the same speed as your vessel
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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（）.AEchoes from a buoyBOwn ship's markerCEcho from a ship on the same course at the same speedDEcho from a ship on a reciprocal course at the same speed
单选题How should you signal the crane operator to move slowly?（）.AUse one hand to give any miotion signal , and place the other hand motionless in front of the hand giving the motion signalBExtend arm with the thumb pointing up , and flex the fingers in and out for as long as the load movement is desiredCFirst tap your elbow with one hand , and then proceed to use regular signalsDFirst tap the top of your head with your first , and then proceed to use regular signals