Lubber line

Lubber line. The reference line used in a magnetic compass or heading indicator.
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Lubber Line: A line fixed to the forward end of a compass bowl. It corresponds to the nose of an aeroplane and enables the pilot to determine the direction in which the aeroplane is heading at any time.
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Lubber line serves as heading index
Course Deviation Indicator (CDI) gives course flown
To/From flag and needle points parallel the to or from without reverse sensing
Miniature aircraft gives visual angle of heading and course flown ...