True magnetic compass

Details True magnetic compass True magnetic compass

1995-01-26

1996-10-22

Fulton, Christopher W.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33349, 33352, G01C 1714

Patent

active

055664628

ABSTRACT:
A magnetic compass comprising an arrangement to displace a correcting marker to create a compass correcting coefficient equal to the sum of the variation and the deviation errors effecting the compass so as to counteract the compass error, and to indicate the true course. The correcting marker becomes the steering reference and a vessel is steered so that the correcting marker is aligned with the true course to be steered by the vessel. Repeaters fed from this compass, which repeaters are fed by the hunting between the compass card and the displaceable correcting marker, indicate the true course as well as true bearings. The displacement of the correcting marker can be controlled from a computer programme which displaces the correcting marker in dependence upon the effecting variation and deviation. Thus the magnetic compass shows true course and the repeaters show true course and true bearings automatically.

REFERENCES:
patent: 587954 (1897-08-01), Gathmann
patent: 2411866 (1946-12-01), Braddon
patent: 2424254 (1947-07-01), Sawyer
patent: 2464544 (1949-03-01), Agins
patent: 3210860 (1965-10-01), Lieberman et al.
patent: 3813792 (1974-06-01), Jarvenpaa

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