Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. These correctors are the（）.

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• Error may be introduced into a magnetic compass by（）.

  A . making a structural change to the vessel B . a short circuit near the compass C . belt buckles D . All of the above

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• A vessel is heading magnetic northwest and its magnetic compass indicates a heading of 317°. What action should be taken to remove this error during compass adjustment? （）

  A . If the quadrantal spheres are out as far as possible replace them with smaller spheres B . If the quadrantal spheres are in as far as possible remove one of the spheres C . If the quadrantal spheres are in as far as possible replace them with smaller spheres D . If the quadrantal spheres are out as far as possible，move the quadrantal spheres i

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• The difference between magnetic heading and compass heading is called（）.

  A . variation B . deviation C . compass error D . drift

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• When a magnetic compass is not in use for a prolonged period of time it should（）.

  A . be shielded from direct sunlight B . be locked into a constant heading C . have any air bubbles replaced with nitrogen D . have the compensating magnets removed

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• What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）

  A . Quadrantal spheres B . Heeling magnets C . Athwartships magnets D . Fore-and-aft magnet

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• The compass error of a magnetic compass that has no deviation is（）.

  A . zero B . equal to variation C . eliminated by adjusting the compass D . constant at any geographical locatio

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• The Flinders bar on a magnetic compass compensates for the（）.

  A . induced magnetism in vertical soft iron B . induced magnetism in horizontal soft iron C . permanent magnetism in ship's steel D . vessel's inclination from the vertical

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• A single vertical magnet placed underneath the compass in the binnacle is used to compensate for（）.

  A . the horizontal component of the permanent magnetism B . deviation caused by the vessel's inclination from the vertical C . induced magnetism in the horizontal soft iron D . induced magnetism in the vertical soft iro

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• A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. What action should be taken to remove this error during compass adjustment? （）

  A . Move the quadrantal spheres closer to the compass B . Raise the heeling magnet if the red end is up C . Remove some of the Flinders bar D . Raise or lower the athwartship magnet

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• Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.

  A . Heeling magnet B . Flinders bar C . Fore-and-aft magnets D . All of the above can be set on magnetic east or magnetic west heading

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• A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°. Which action should be taken to remove this error during compass adjustment?（）

  A . If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should add some magnets. B . If the blue ends of the magnets are aft you should lower the fore-and-aft tray C . If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should reverse the magnets D . If the blue ends of the magnets are forward，and the fore-and-aft tray is at the bottom，you should add some magnet

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• A vessel is heading magnetic northwest and its magnetic compass indicates a heading of 312°. What action should be taken to remove this error during compass adjustment? （）

  A . If the quadrantal spheres are all the way out，replace them with smaller spheres B . If the quadrantal spheres are all the way in，replace them with larger spheres C . If the quadrantal spheres are all of the way out，move the spheres in D . If the quadrantal spheres are all the way out，replace them with larger spheres.

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• When adjusting a magnetic compass for error，a deviation table should be made（）.

  A . before correcting for any deviation B . after correcting for variation C . after adjusting the fore-and-aft and athwartships permanent magnets D . before the quadrantal correctors are placed on the compa

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• The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.

  A . nonmagnetic B . weatherproof C . corrosion resistant D . capable of being permanently affixed to the vessel

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• Before sailing，mariners on duty shall check the headings of magnetic compass by comparison with（）.

  A . ship's clock B . engine movement recorder C . repeaters D . navigation light

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• Magnets in the binnacles of magnetic compasses are used to reduce the effect of（）.

  A . deviation B . variation C . local attraction D . All of the above

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• If a magnetic compass is not affected by any magnetic field other than the Earth’s，which statement is TRUE?（）.

  A . Compass error and variation are equal B . Compass north will be true north C . Variation will equal deviation D . There will be no compass error

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• The lubber’s line on a magnetic compass indicates（）.

  A . compass north B . the direction of the vessel's head C . magnetic north D . a relative bearing taken with an azimuth circle

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• By convention，the north seeking ends of a compass’ magnets are colored（）.

  A . Black B . Blue C . Red D . White

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• What is the basic principle of the magnetic compass?（）

  A . Magnetic materials of the same polarity repel each other and those of opposite polarity attract B . The Earth's magnetic lines of force are parallel to the surface of the Earth C . Magnetic meridians connect points of equal magnetic variation D . The compass needle(s) will，when properly compensated，lie parallel to the isogonic lines of the Earth

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• The total magnetic effects which cause deviation of a vessel’s compass can be broken down into a series of components which are referred to as（）.

  A . divisional parts B . coefficients C . fractional parts D . equatio

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• Magnetic compass deviation（）.

  A . varies depending upon the bearing used B . is the angular difference between magnetic north and compass north C . is published on the compass rose on most nautical charts D . is the angular difference between geographic and magnetic meridia

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• Magnetic heading differs from compass heading by（）.

  A . compass error B . true heading C . variation D . deviatio

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• 266. Magnetic compass deviation ______.

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