A.Mean low water
B.Mean high water
C.Average water level
D.Geographical sea level
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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
A.range of tide
B.height of tide
C.charted depth
D.actual water depth
A.difference in longitude
B.mid-longitude
C.departure
D.meridian angle
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Areas enclosed by a long and short dashed magenta line indicate （）.
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
The Earth has the shape of a(n) （）.
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
A vessel is entering port A for the first time and has a Pilot conning the vessel. The Master is unsure that the Pilot is taking sufficient action to prevent a collision. What should the Master do（）.
Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.
The distance between any two meridians measured along a parallel of latitude （）.
The meaning of ebb tide is that （）.
The period at high or low tide during which there is no change in the height of the water is called the （）.