A.depth of water at a specific time due to tidal effect
B.difference between the depth of the water and the area's tidal datum
C.difference between the depth of the water and the high water tidal level
D.difference between the depth of the water at high tide and the depth of the water at low tide
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A. the angle between the horizontal and the line of sight to the visible horizon
B. index error
C. parallax
D. terrestrial refraction
A.Mean low water
B.Mean high water
C.Average water level
D.Geographical sea level
A.the time of day
B.the seasons
C.geography
D.All of the above
A.sphere
B.oblate spheroid
C.spheroid of revolution
D.oblate eggoid
A.air gap
B.freeboard
C.penetration
D.water depth
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The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
A vessel not to impede the passage of another vessel is not relieved （） taking collision-avoiding action.
Clearance gauges at bridges indicate （）.
The height of a light is measured from which reference plane?（）
Above-normal tides near the center of a hurricane maybe caused by the （）.
Areas enclosed by a long and short dashed magenta line indicate （）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
A tug is to assist in docking an oceangoing vessel on a hawser. The greatest danger to the tug is （）.
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
During a period of whiteout，you should expect which of the following（）.