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單項選擇題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（）.

A.The generated CPA will be less than the actual CPA
B.The generated TCPA will be later than the actual TCPA
C.The range of initial target acquisition will be less than normal
D.The targets true course vector will be in error

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1.單項選擇題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（）.

A.The ARPA will generate data as if the target was still being tracked by radar
B.The ARPA will give an audible and/or visual lost target alarm
C.The ARPA will generate data based on sea return echoes from the vicinity where the target was lost
D.The ARPA has lost all memory of the target and must recompute the target data

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2.單項選擇題The development of（）led to the fully automatic ARPA systems installed on commercial ships.

A.SeaTalk
B.powerful microprocessors and mega memory capacity
C.chartplotter
D.small-scale chart

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3.單項選擇題The（）has a built-in world map; most areas are displayed on a scale of 4000 nm from the top to the bottom of the screen，and can be zoomed in to 150 nm.

A.chartplotter
B.C-MAP NT
C.C-Cards
D.PPI

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4.單項選擇題Radar reflectors are required for（）.

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

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5.單項選擇題PPI is（）.

A.a plan-position indicator system
B.pulse-plan integration
C.pulse-pulse input
D.power-plan input

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