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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On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
During daylight savings time the meridian used for determining the time is located farther （）.
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
Conditions for crossing a rough bar are usually best at （）.
As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
An occulting light is one in which （）.
The distance between the surface of the water and the tidal datum is the （）.
AFTER DROPPING THE PILOT means （）.
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
A tug is to assist in docking an oceangoing vessel on a hawser. The greatest danger to the tug is （）.