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The Practical Mariner's Book of Knowledge: 420 Sea-Tested Rules of Thumb for Almost Every Boating Situation is written by John Vigor and published by McGraw Hill Professional. It's available with International Standard Book Number or ISBN identification 0070674752 (ISBN 10) and 9780070674752 (ISBN 13).
Between these covers is the essence of centuries of seafaring experience, distilled into a concise, alphabetically organized reference for sailors and powerboaters. You'll find rules of thumb for hull thickness, bottom paint coverage, estimating distances, when to hoist and lower flags, predicting weather, which colors are unlucky, rope size and strength, anchoring rights, making a rum punch, and a lot more. This is either the most useful boating book ever designed to entertain or the most entertaining book ever designed to be useful. Open it to any page and browse awhile. You'll see.