On a Mercator chart, where do you read the longitude of a plotted position?

A. From the left and right (side) scales
B. From the latitude scale at the working latitude
C. From the compass rose
✓ From the top and bottom scalesCorrect

Why D is correct

On a Mercator chart, latitude is read from the side scales and longitude from the top and bottom scales. The latitude scale is used for distance measurement, not for reading longitude. (Bowditch Ch. 4 §405)

Cited:Bowditch Ch. 4 §405

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On a Mercator chart, where do you read the longitude of a plotted p… — USCG Exam Practice · CaptainsGround