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
相关考题
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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
