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USCG Exam PracticePlotting with variation and deviation (T-V-M-D-C)

Deviation differs from variation in that deviation changes with which factor?

  1. A. The vessel's geographic position
  2. ✓ The vessel's headingCorrect
  3. C. The annual rate of change printed on the compass rose
  4. D. The sounding datum used on the chart

Why B is correct

Deviation is caused by the vessel's own magnetism and changes with the vessel's heading; it is read from the deviation card for each heading. Variation changes with geographic position and slowly over time, not with heading.

Cited:Bowditch Ch. 6 §601

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Deviation differs from variation in that deviation changes with whi… — USCG Exam Practice · CaptainsGround