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
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A.the best fix is obtained by using a tangent bearing and a range
B.and using two radar ranges for a fix，the objects of the ranges should be close to reciprocal bearings
C.and using ranges，the most rapidly changing range should be measured last
D.and crossing a radar range of one object with the visual bearing of a second object，the two objects should be 80°to 110°apart
A.Increase the radar gain to pick up weak echoes through the rain
B.Increase the STC setting to reduce close-in spurious signals
C.Navigate as though the effective range of the radar has been reduced
D.Increase the range of the inner and outer guard rings
A.The target vessel's generated course and speed are based solely on radar inputs
B.Navigational constraints may require a target vessel to change course
C.The trial maneuver feature will automatically determine a course that will clear all targets
D.You cannot determine if a small target has been lost due to sea return
A.center bearings
B.tangent bearings
C.ranges
D.objects that are close aboard
A.station the look-out in the wheelhouse to keep a continuous watch on the radar
B.secure the sounding of fog signals until a vessel closes within five miles
C.station a look-out as low down and far forward as possible
D.keep the radar on the shortest available range for early detection of approaching vessels
最新試題
（）is not used in modern radar.
Radar reflectors are required for（）.
Which statement about an estimated position is TRUE?（）
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（）.
Although manual plotting for CPA works well，the workload can become overwhelming when confronted with（）.
PPI is（）.
The development of（）led to the fully automatic ARPA systems installed on commercial ships.
Which procedure(s) shall be used to determine risk of collision? （）
You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.
When will the float-free emergency position indicating radiobeacon be activated after abandoning ship? （）