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
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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
A.Set and drift of the current
B.Relative track information
C.Predicted time of CPA
D.Initial range of acquisition
最新試題
Radar reflectors are required for（）.
Which condition indicates that your radar needs maintenance?（）
（）is not used in modern radar.
Which statement is true concerning a vessel equipped with operational radar?（）.
（）is not a job of the radar antenna.
PPI is（）.
When will the float-free emergency position indicating radiobeacon be activated after abandoning ship? （）
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（）.
What provides little or no indication that a vessel is dragging anchor? （）
Which statement concerning the operation of radar in fog is TRUE?（）