The compass heading of a vessel differs from the true heading by（）.

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

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

A . The course change should be made rapidly to prevent transient induced magnetism while passing the intercardinal headings B . After the new heading is reached，the vessel should steam on that course for at least two minutes before the adjustment C . During the course change，you should gently tap the compass to remove any error caused by friction on the pivot bearing D . After steadying on the new heading，the compass card should be slewed by a magnet and allowed to oscillate freely to remove any gaussin error

A . kg B . MPa C . meter fluid column D . None of the above is true

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

A . the deviation has been offset by the variation B . there is something wrong with the compass C . the compass is being influenced by nearby metals D . there is no deviation on that heading

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

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

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

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.

A . compass error B . latitude C . variation D . deviatio

A . Flinders bar B . transverse magnets C . fore-and-aft magnets D . soft iron spheres on the sides of the compa

A . into the wind B . away in fire and smoke C . directly to the standby boat D . directly to the nearest land

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

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

A . 3 hours B . 6 1/2 hours C . 12 1/2 hours D . 25 hour

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

A . kg B . MPa C . mH20 D . None of the above

A . the compass heading is in line with the lubber's line B . there is no lost motion in the gimbal rings C . no change of heading by compass is observed if you raise and lower the heeling magnet D . the gimbal rings do not strike the compass frame when they are tilted

A . Card B . Needle C . Lubber's line D . Gimbal

A、true directions B、compass error C、deviation D、magnetic directions