单项选择题
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
If the compass heading and the magnetic heading are the...
单项选择题If the compass heading and the magnetic heading are the same then（）.
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
