Question 454Navigation General

The correct answer is A) annual rate of variation change. The compass rose on a nautical chart indicates both the magnetic variation (also called declination) and the annual rate of variation change. Magnetic variation is the angle between true north and magnetic north, while the annual rate of variation change shows how quickly the magnetic variation is changing over time. The other options are incorrect because: B) precession refers to the slow gyroscopic-like motion of the Earth's axis, C) deviation is the local magnetic disturbance caused by the ship's own metal components, and D) compass error is the combined effect of variation and deviation.