A.She must use this equipment to obtain early warning of risk of collision
B.The use of a radar excuses a vessel from the need of a look-out
C.The radar equipment is only required to be used in restricted visibility
D.The safe speed of such a vessel will likely be greater than that of vessels without radar
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A.Radar ranges are less accurate in fog
B.Navigation buoys will always show up on radar
C.A sandy beach will show up clearer on radar than a rocky cliff
D.Small wooden boats may not show up on radar
A.It is more reliable than a fix based on radar bearings
B.It may be based on a single LOP or questionable data
C.When a 3-LOP fix plots in a triangle，the center of the triangle is the estimated position
D.It is usually based on soundings
A.Watching the compass bearing of an approaching vessel
B.Systematic observation of objects detected by radar
C.Long-range radar scanning
D.All of the above
A.Raising the antenna height increases the radar range
B.The ability of radar to detect objects is unaffected by weather conditions
C.Radar bearings are less accurate than radar ranges
D.Radar should be checked regularly during clear weather to ensure that it is operating properly
A.Serrated range rings
B.Indirect echoes
C.Multiple echoes
D.Blind sector
最新試題
（）is not used in modern radar.
Which general statement concerning radar is FALSE?（）.
What provides little or no indication that a vessel is dragging anchor? （）
When using the ARPA in heavy rain，which action should you take? （）
When you turn on the fast time constant (differentiator) control of a radar it will（）.
When will the float-free emergency position indicating radiobeacon be activated after abandoning ship? （）
You are scanning the radar screen for a buoy fitted with racon. How should this signal appear on the PPI display?（）
Which statement concerning the operation of radar in fog 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（）.
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（）.