Method and apparatus for precise calibration of magnetic compass

Geometrical instruments – Straight-line light ray type – Celestial

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33356, G01C 1738

Patent

active

053967097

ABSTRACT:
An apparatus and method for compensating for the measured variation in bearing between magnetic north as read on a compass and true north as may be determined by juxtaposition with the sun at a given time. Such apparatus and method is particularly useful in vessels or other environments in which there are either or both disturbances in the natural magnetic flux pattern of the earth and natural variations between natural magnetic and true north.

REFERENCES:
patent: 538889 (1895-05-01), Arvidson
patent: 628600 (1899-07-01), Fields
patent: 629757 (1899-07-01), Christensen
patent: 686127 (1901-11-01), Potter
patent: 961862 (1910-06-01), Huntington
patent: 1130625 (1915-03-01), Peck
patent: 1188522 (1916-06-01), Woodward
patent: 1218422 (1917-03-01), Lietz
patent: 2839833 (1958-06-01), Haoner

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