A.radio signals reflect from a solid surface
B.sound waves travel at a constant speed through water
C.radar signals travel at a constant speed through water
D.pressure increases with depth
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A.Water temperature
B.Climatology data
C.Speed of advance
D.Depth contours
A.Soundings
B.Waypoints
C.Meteorological data
D.Radar targets
A.Radar targets
B.ARPA vectors
C.Hydrographic data
D.All of the above
A.beam
B.radar
C.light beacon
D.reflector
A.Straight line
B.Arc
C.Parabola
D.Hyperbola
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AREAS WHICH CANNOT BE SCANNED BY THE RADAR OF THE VESSEL BECAUSE THEY ARE SHIELDED BY PARTS OF ITS SUPERSTRUCTURE，MASTS，ETC means（）.
A radar contact will remain stationary on a relative motion radar display only when it is（）.
Deviation in a compass is caused by the（）.
（）20 targets can be tracked at one time．When maximum tracking capacity is reached，no further acquisitions are possible.
The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.
A Doppler log in the volume reverberation mode indicates（）.
The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.
How is variation indicated on a small-scale nautical chart?（）.
Gyrocompass repeaters reproduce the indications of the master gyrocompass. They are（）.
A deadhead is a(n)（）.