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
You are underway at 5 knots and see on your radar a contact 10 miles directly astern of you. 12 minutes later，the contact is 8 miles directly astern of you. What is the estimated speed of the contact? （）
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（）.
You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.
You are underway in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.
What provides little or no indication that a vessel is dragging anchor? （）
When using the ARPA in heavy rain，which action should you take? （）
Which statement is true concerning a vessel equipped with operational radar?（）.
When you turn on the fast time constant (differentiator) control of a radar it will（）.
（）is not a job of the radar antenna.
When navigating in thick fog with the radar on，you should（）.