A.sphere
B.oblate spheroid
C.spheroid of revolution
D.oblate eggoid
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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
A.increases in north latitude and decreases in south latitude
B.decreases as DLO increases
C.increases with increased latitude
D.decreases with increased latitude
A.set the vessel to the left
B.set the vessel to the right
C.offer resistance in the form of a head current
D.furnish additional thrust in the form of a fair or following current
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The height of tide is the （）.
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
The height of a light is measured from which reference plane?（）
The distance between any two meridians measured along a parallel of latitude （）.
Above-normal tides near the center of a hurricane maybe caused by the （）.
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 pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
Conditions for crossing a rough bar are usually best at （）.