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
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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
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
A.Immediately after floating free
B.After about one hour when the salt water activates the battery
C.Only when keyed by the radar of another vessel
D.Only when daylight activates the photovoltaic cell
最新試題
What provides little or no indication that a vessel is dragging anchor? （）
PPI is（）.
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（）.
（）is not a job of the radar antenna.
Which statement is TRUE concerning a vessel equipped with operational radar?（）.
Which general statement concerning radar is FALSE?（）.
You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.
Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.
Which ARPA data should you use in order to determine if a close quarters situation will develop with a target vessel? （）
When you turn on the fast time constant (differentiator) control of a radar it will（）.