What incremental precision is preferred for the compass when measuring magnetic variation?

• A. 0.5-degree increments
• B. 2-degree increments
• C. 1-degree increments
• D. 1-degree increments or finer

Answer: (D)

When measuring magnetic variation, you want enough resolution to reflect small changes accurately. Variation is the angular difference between true north and magnetic north, and navigational calculations rely on expressing that value precisely. Using only coarse steps limits how accurately you can record the variation, especially in areas where it changes gradually or has minor local nuances. Therefore, the best choice is to record variation in 1-degree increments or finer, because it provides a reliable baseline of one degree while allowing even more precision if the instrument permits.