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Q11114
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Which declination direction is to be used for the - sign in true bearing line?
Q11115
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Which declination direction is to be used for the + sign in magnetic bearing line?
Q11116
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Which declination direction is to be used for the - sign in magnetic bearing line?
Q11117
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Which variations occurred by magnetic storms?
Q11118
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Which is the variations of magnetic meridian swings like a pendulum?