单选题On a nautical chart，the inner ring of a compass rose indicates（）.Atrue directionsBcompass errorCdeviationDmagnetic directions
单选题
On a nautical chart，the inner ring of a compass rose indicates（）.
A
true directions
B
compass error
C
deviation
D
magnetic directions
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单选题The most accurate method of determining gyrocompass error while underway is by（）.AComparing the gyro azimuth of a celestial body with the computed azimuth of the bodyBComparing the gyro heading with the magnetic compass headingCDetermining from the chart the course made good between celestial fixesDIt cannot be determined accurately at sea due to drift of unknown currents
单选题Which information does the outer ring of a compass rose on a nautical chart provide（）.AvariationBtrue directionsCmagnetic directionsDannual rate of variation change
单选题The compass rose on a nautical chart indicates both variation and （）.AdeviationBannual rate of variation changeCprecessionDcompass error
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单选题What is an advantage of the magnetic compass aboard vessels?（）ACompass error is negligible at or near the earth's magnetic polesBIt does not have to be checked as oftenCIt is reliable due to it's essential simplicityDAll points on the compass rose are readily visible
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单选题How is variation indicated on a small-scale nautical chart?（）.AMagnetic compass tableBMagnetic meridiansCIsogonic linesDVariation is not indicated on small-scale nautical charts
单选题Top and inner graduated borderlines of the chart are（）.Ascales of latitudeBscales of longitudeCcompass roseDsource data
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单选题Magnetic compass deviation（）.Avaries depending upon the bearing usedBis the angular difference between magnetic north and compass northCis published on the compass rose on most nautical chartsDis the angular difference between geographic and magnetic meridians
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