Question 647Navigation General70% to pass
When changing from a compass course to a true course you should apply _______________.
AI Explanation
The correct answer is B) variation and deviation.
When changing from a compass course to a true course, you need to apply both variation (the angle between true north and magnetic north) and deviation (the angle between the compass needle and the magnetic north) to convert the compass course to a true course. Variation is a geographic correction that accounts for the difference between true north and magnetic north, while deviation is a compass-specific correction that accounts for local magnetic disturbances.
The other options are incorrect because:
A) Applying a correction for current set is only necessary when converting between compass course and water course, not when converting between compass course and true course.
C) Variation alone is not sufficient, as deviation must also be accounted for.
D) Deviation alone is not sufficient, as variation must also be accounted for.
Related Questions
#645 The standard magnetic compass heading differs from the true heading by _______________.#646 Compass error is equal to the _______________.#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? #649 The chart indicates the variation was 3°45'W in 1988, and the annual change is increasing 6'. If you use the chart in 1991 how much variation should you apply? #650 The chart indicates the variation was 3°45'E in 1988, and the annual change is increasing 6'. If you use the chart in 1991 how much variation should you apply?