A.radar scanning
B.radar plotting
C.compass bearings
D.All of the above
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A.the shore is bluff and rocky
B.of offshore exposed rocks
C.submerged reefs cause prominent breakers
D.the lookout tower is marked with radar reflectors
A.a few centimeters
B.a few fathoms
C.a few meters
D.a few feet
A.gain control
B.sensitivity time control
C.fast time constant
D.pulse length control
A.sensitivity time control (sea clutter control)
B.receiver gain control
C.brilliance control
D.fast time constant (differentiator)
A.sensitivity time control (sea-clutter control)
B.receiver gain control
C.brilliance control
D.fast time constant (differentiator)
最新試題
The（）has a built-in world map; most areas are displayed on a scale of 4000 nm from the top to the bottom of the screen，and can be zoomed in to 150 nm.
When will the float-free emergency position indicating radiobeacon be activated after abandoning ship? （）
PPI is（）.
Which ARPA data should you use in order to determine if a close quarters situation will develop with a target vessel? （）
Which statement about an estimated position is TRUE?（）
You are scanning the radar screen for a buoy fitted with racon. How should this signal appear on the PPI display?（）
Your ARPA has automatic speed inputs from the log．Due to currents，the log is indicating a faster speed than the speed over the ground.What should you expect under these circumstances（）.
Your ARPA has been tracking a target and has generated the targets course and speed.The radar did not receive a target echo on its last two scans due to the weather.What should you expect under these circumstances（）.
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（）.
When navigating in thick fog with the radar on，you should（）.