单项选择题

A line of position is（）.

A.a line connecting two charted objects
B.a line on some point of which the vessel may be presumed to be located
C.the position of your vessel
D.not used in a running fix

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单项选择题A line connecting all possible positions of your vessel at any given time is a（）.

A.longitude line
B.latitude line
C.line of position
D.fix

单项选择题A large navigational buoy (LNB) is painted（）.

A.red
B.yellow
C.with red and white vertical stripes
D.with a distinct color and pattern unique to each buoy

单项选择题A fairly accurate estimation of a ship’s position can be calculated by a technique known as（）.

A.dead reckoning
B.Pilotage
C.great circle sailing
D.geographic navigation

单项选择题A dead reckoning (DR) plot（）.

A.must utilize magnetic courses
B.must take set and drift into account
C.should be replotted hourly
D.should be started each time the vessel's position is fixed

单项选择题A dead reckoning (DR) plot（）.

A.ignores the effect of surface currents
B.is most useful when in sight of land
C.must be plotted using magnetic courses
D.may be started at an assumed position