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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（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.
（）is on the panel of radar.
A Doppler speed log indicates speed over ground（）.
（）the canal transit，the radar was operating.
An ECDIS is required to display which information?（）
A radar range to a small，charted object such as a light will provide a line of position in which form?（）.
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.
A radar display in which North is always at the top of the screen is a(n)（）.
What will NOT induce errors into a doppler sonar log?（）
A deadhead is a(n)（）.