单项选择题

Which statement concerning the operation of radar in fog is TRUE?（）

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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热门试题

单项选择题Which statement about an estimated position is TRUE?（）

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

单项选择题Which procedure(s) shall be used to determine risk of collision? （）

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

单项选择题Which general statement concerning radar is FALSE?（）.

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

单项选择题Which condition indicates that your radar needs maintenance?（）

A.Serrated range rings
B.Indirect echoes
C.Multiple echoes
D.Blind sector

单项选择题Which ARPA data should you use in order to determine if a close quarters situation will develop with a target vessel? （）

A.Set and drift of the current
B.Relative track information
C.Predicted time of CPA
D.Initial range of acquisition