lubber line

lubber's 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, lubber line.
Also called lubber's mark, lubber's point.

1855–65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lubber line
Also called: lubber's line a mark on a ship's compass that designates the fore-and-aft axis of the vessel

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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