Lubber line
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A lubber line, also known as a lubber's line,[1][2] is a fixed line on a compass binnacle or radar plan position indicator display pointing towards the front of the ship or aircraft[3] and corresponding to the craft's centerline (being the customary direction of movement).
The line represents 0
Compasses on sailboats may have additional lubber lines at forty-five degrees from the centerline. This represents about as close to the wind as the average boat will sail. These lubber lines may be used when sailing
Directional Gyros on aircraft also have additional forty-five degree lubber lines. These are useful for intercepting tracks and making procedure turns.
Etymology
The name comes from "lubber", a nautical term for a novice sailor or landlubber. It has also been called a lubber's mark or lubber's point, though use of these terms declined in the 20th century.[2]
References
- ^ "Navigation: The magnetic compass". www.britannica.com. Encyclopedia Britannica. Retrieved 15 June 2022.
- ^ a b "lubber". www.oed.com. Oxford English Dictionary. Retrieved 15 June 2022.
- ^ Skill in the Surf: A Landing Boat Manual. U.S. Navy. 1945. p. 97. Retrieved 16 December 2018.