单项选择题

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

<上一题目录没有了>

热门试题

单项选择题

Your radar displays your ship off center．As you proceed on your course， your ship’s marker moves on the PPI scope while echoes from land masses remain stationary.What is this display called（）.

A.Off center
B.True motion
C.Stabilized
D.Head up

单项选择题

Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.

A.Alert the watch officer that a vessel is approaching the preset CPA limit
B.Warn of small targets that are initially detected closer than the outer guard zone
C.Guard against target loss during critical maneuvering situations
D.Sound an alarm for targets first detected within the zone