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lubber's line

or lubber line

noun, Navigation.
a vertical line on the forward inner side of the bowl of a fixed compass, used as a reference mark indicating the heading of a vessel.
Also called lubber's mark, lubber's point.
Origin of lubber's line
First recorded in 1855-65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for lubber line
Historical Examples
  • While he had winked his eyes, so it seemed to him, the true course had fairly straddled away from the lubber line.

    Blow The Man Down Holman Day
  • Now go to your compass and see that its lubber line is exactly fore and aft and in the keel line of the ship.

    Lectures in Navigation Ernest Gallaudet Draper
British Dictionary definitions for lubber line

lubber line

a mark on a ship's compass that designates the fore-and-aft axis of the vessel Also called lubber's line
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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