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
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相关考题
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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 -
单项选择题
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 -
单项选择题
When will the float-free emergency position indicating radiobeacon be activated after abandoning ship? （）
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
