lubber's line

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lubber line

also lub·ber's line  (lŭb′ərz)
A line or mark on a compass that is aligned with the central axis of a moving body, especially a ship or aircraft, and represents the heading.


(or lub′ber) line`,

a reference mark on a compass or other navigational instrument indicating the heading of a vessel.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.lubber's line - a fixed line on a ship's compass indicating its heading
point of reference, reference point, reference - an indicator that orients you generally; "it is used as a reference for comparing the heating and the electrical energy involved"