Not necessarilly. Great Lake charts are in statute miles and use Poly
Conic projection, rather than the Mercator that the off shore charts
use.


Reply

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An exception somewhat proving the rule.

I'm not familiar with charts for the Great Lakes, of course, but it's
surprising they wouldn't follow the convention of the majority of the
world.

Do Great Lakes sailors discuss vessel speed or wind speeds in knots or
MPH?