The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.

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

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

单项选择题On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.

A.Canary Current
B.Benguela Current
C.Agulhas Current
D.South Atlantic Current