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
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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
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
最新試題
Your radar is set on a true motion display.Which of the following will NOT appear to move across the PPI scope（）.
When using an ARPA，what should you consider in order to evaluate the information displayed?（）
When using the ARPA in heavy rain，which action should you take? （）
Which statement is TRUE concerning a vessel equipped with operational radar?（）.
When using a radar in a unstabilized mode，fixes are determined most easily from（）.
Your ARPA has automatic speed inputs from the log．Due to currents，the log is indicating a faster speed than the speed over the ground.What should you expect under these circumstances（）.
You are underway in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.
Which condition indicates that your radar needs maintenance?（）
Which statement about an estimated position is TRUE?（）
The development of（）led to the fully automatic ARPA systems installed on commercial ships.