Method and apparatus for determining and recording boat compass

Details Method and apparatus for determining and recording boat compass Method and apparatus for determining and recording boat compass

1979-03-08

1980-12-30

Martin, Jr., William D.

Geometrical instruments

Straight-line light ray type

With magnetic compass

33274, G01C 2122, G01C 1710

Patent

active

042415110

ABSTRACT:
A method and apparatus for determining and recording boat compass deviation which includes a novel apparatus which may be oriented with respect to either a line of sight bearing or a compass reading and includes means for recording at predetermined annular increments the difference between the boat's compass heading and the magnetic heading of the vessel.

REFERENCES:
patent: 1615507 (1927-01-01), Fisher
patent: 1949422 (1934-03-01), Karnes
patent: 2015627 (1935-09-01), Hug
patent: 2099772 (1937-11-01), Seidelhuber

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