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lubber's line

or lubber line

noun Navigation.
  1. 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.
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Origin of lubber's line

First recorded in 1855–65
Also called lubber's mark, lubber's point.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for lubber line

lubber line

noun
  1. a mark on a ship's compass that designates the fore-and-aft axis of the vesselAlso called: lubber's line
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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