What is the difference between magnetic variation and deviation, and how do they affect bearing plotting?

• A. Variation is the difference between true north and magnetic north; deviation is the vessel's own magnetic interference with the compass; True = Compass + Deviation + Variation.
• B. Variation is the difference between true north and magnetic north; Deviation is the wind effect; True = Magnetic + Deviation.
• C. Variation and deviation are the same concept; True = Magnetic + Variation.
• D. Variation is used in chart plotting; Deviation is ignored in bearing calculations.

Answer: (A)