单项选择题
A.accurate only in the Polar regions B.accurate electronic servomechanisms C.hand operated D.accurate only if the vessel is underway
How is variation indicated on a small-scale nautical ch...
单项选择题How is variation indicated on a small-scale nautical chart?（）.
A.Magnetic compass table B.Magnetic meridians C.Isogonic lines D.Variation is not indicated on small-scale nautical charts
If（）is shut down for an extended time optimum position ...
单项选择题If（）is shut down for an extended time optimum position fixing will take up to 2 hours after power is reapplied．
A.radar B.DF C.Satellite Navigator D.Automatic Omega Navigator
If a magnetic compass is not affected by any magnetic f...
单项选择题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
