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
Which statement about an estimated position is TRUE?（）
You are using a radar in which your own ship is shown at the center，and the heading flash always points to 0°. If bearings are measured in relation to the flash，what type of bearings are produced? （）
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（）.
Which procedure(s) shall be used to determine risk of collision? （）
Radar reflectors are required for（）.
（）is not a job of the radar antenna.
Which general statement concerning radar is FALSE?（）.
Your radar displays your ship off center．As you proceed on your course， your ship’s marker moves on the PPI scope while echoes from land masses remain stationary.What is this display called（）.
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 two guard zones.What is the purpose of the inner guard zone（）.