On a Mercator projection chart, where does the mariner read the longitude scale?

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

Why A 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 longitude.

Cited:Bowditch Ch. 4 §405

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