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post #9 of Old 10-04-2012
Classic30
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Re: Great Lakes Boaters, Polyconic charts, mph

Quote:
Originally Posted by jackdale View Post
It is the latitude scale, used to measure distance on a Mercator projection.
So, as a Yachtmaster Instructor, you're telling me that the bit I circled doesn't represent a distance of ten nautical miles??

From wonderful wikipedia: "The nautical mile (symbol M, NM or nmi) is a unit of length that is about one minute of arc of latitude measured along any meridian... By international agreement it is 1,852 metres (approximately 6,076 feet)."

Perhaps it's a good thing I'll never have to sail in that part of the world.

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"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"

Last edited by Classic30; 10-04-2012 at 02:02 AM. Reason: read the scale wrong
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