Question 645Navigation General70% to pass
The standard magnetic compass heading differs from the true heading by _______________.
AI Explanation
The correct answer is B) compass error.
The standard magnetic compass heading differs from the true heading due to compass error, which is the combination of variation (the angle between true north and magnetic north) and deviation (the magnetic interference caused by the ship's iron and steel components). Variation is a geographic phenomenon that affects all compasses in a given area, while deviation is specific to the individual vessel.
The other options are incorrect because:
A) Variation is a component of compass error, but not the entire difference.
C) Deviation is a component of compass error, but not the entire difference.
D) Latitude does not directly cause the difference between magnetic and true heading.
Related Questions
#643 If a magnetic compass is not affected by any magnetic field other than the Earth's, which statement is TRUE? #644 The compass error of a magnetic compass that has no deviation is _______________.#646 Compass error is equal to the _______________.#647 When changing from a compass course to a true course you should apply _______________.#648 The chart indicates the variation was 3°45'W in 1988, and the annual change is decreasing 6'. If you use the chart in 1991 how much variation should you apply?