默认题库 - 地文航海

单选题

When using horizontal sextant angles of three objects to fix your position，an indeterminate position will result in which situation（）.

A. The objects lie in a straight line
B. The vessel is inside of a triangle formed by the objects
C. The vessel is outside of a triangle formed by the objects
D. A circle will pass through your position and the three object

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单选题

When navigating a vessel，you（）.

A. Can always rely on a buoy to be on station
B. Can always rely on a buoy to show proper light characteristics
C. Should assume a wreck buoy is directly over the wreck
D. Should never rely on a floating aid to maintain its exact positio

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单选题

What describes a flood current（）.

A. Horizontal movement of the water toward the land after high tide
B. Horizontal movement of the water toward the land after low tide
C. Horizontal movement of the water away from the land following high tide
D. Horizontal movement of the water away from the land following low tide

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单选题

What area of the earth cannot be shown on a standard Mercator chart（）.

A. Equator
B. Areas including both North and South latitudes
C. North and South Poles
D. A narrow band along the central meridia

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单选题

Traffic separation schemes adopted by the IMO are listed in（）.

A. NM
B. Ship's Routing
Colreg
D. Sola

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单选题

The four standard light colors used for lighted aids to navigation are red，green，white，and （）.

A. purple
B. orange
C. blue
D. yellow

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单选题

The equator is（）.

A. the primary great circle of the Earth perpendicular to the axis
B. the line to which all celestial observations are reduced
C. the line from which a celestial body's altitude is measured
D. All of the above

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单选题

A celestial body will cross the prime vertical circle when the latitude is numerically （）.

A. Greater than the declination and both are of the same name
B. Less than the declination and both are of the same name
C. Greater than the declination and both are of contrary name
D. Less than the declination and both are of contrary name

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单选题

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 navigatio

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单选题

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

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