A.give better range performance in rain，hail，etc
B.display small targets in a mass of dense sea clutter at a greater range
C.have less sea return in choppy rough seas
D.display a more map like presentation for inshore navigation
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A.be more suitable for river and harbor navigation
B.provide better range performance on low lying targets during good weather and calm seas
C.have a wider horizontal beam width
D.have more sea return during rough sea conditions
A.sweep introduction
B.sweep interest
C.sweep intention
D.sweep intensity
A.all fishing vessels over 39 feet in length
B.sail-propelled fishing vessels
C.all fishing vessels of less than 200 GT
D.wooden hull fishing vessels with a poor radar echo
A.in dense fog
B.in boisterous weather
C.in the open sea
D.in rivers
A.incorrect image
B.distinctive image
C.pictorial image
D.pictographic image
最新試題
You are scanning the radar screen for a buoy fitted with racon. How should this signal appear on the PPI display?（）
Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.
When using an ARPA，what should you consider in order to evaluate the information displayed?（）
When hitting a solid object such as a ship or an airplane，the radar waves are reflected back （）they came.
What provides little or no indication that a vessel is dragging anchor? （）
When you turn on the fast time constant (differentiator) control of a radar it will（）.
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（）.
When using the ARPA in heavy rain，which action should you take? （）
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（）.