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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On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
The distance between the surface of the water and the tidal datum is the （）.
The period at high or low tide during which there is no change in the height of the water is called the （）.
The meaning of ebb tide is that （）.
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
During daylight savings time the meridian used for determining the time is located farther （）.
The distance between any two meridians measured along a parallel of latitude （）.