单项选择题

The distance between the surface of the water and the tidal datum is the （）.

A.range of tide
B.height of tide
C.charted depth
D.actual water depth

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单项选择题

The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.

A.difference in longitude
B.mid-longitude
C.departure
D.meridian angle

单项选择题

The distance between any two meridians measured along a parallel of latitude （）.

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

单项选择题

On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.

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