單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題Which condition indicates that your radar needs maintenance?（）

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

4.單項選擇題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

5.單項選擇題When you turn on the fast time constant (differentiator) control of a radar it will（）.

A.enhance weak target echoes and brighten them on the PPI
B.reduce clutter over the entire PPI by shortening the echoes
C.only suppress weak targets to a limited distance from the ship (sea clutter)
D.reduce the beam width to provide a map-like presentation for navigation