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USCG Exam PracticePlot true course and distance between two charted points

When measuring distance on a Mercator chart, the mariner should use which scale?

  1. A. The longitude scale along the top or bottom of the chart
  2. B. The compass rose scale
  3. ✓ The latitude scale at the working latitudeCorrect
  4. D. Any convenient scale on the chart border

Why C is correct

One minute of latitude equals one nautical mile, so distance must be measured on the latitude scale at the latitude of the line being measured, never on the longitude scale. (Bowditch Ch. 4 §405, §406)

Cited:Bowditch Ch. 4 §405Bowditch Ch. 4 §406

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When measuring distance on a Mercator chart, the mariner should use… — USCG Exam Practice · CaptainsGround