A sphere of specified radius about the magnetic compass location to be kept free of any magnetic or electrical equipment which would interfere with the compass.



Related Terms

FLOAT CHAMBER

A sealed, hollow part attached to the compass card of a magnetic compass as part of the compass card assembly, to provide buoyancy to reduce the friction on the pivot bearing

SHADOW PIN

A small rod or pin used to cast a shadow on an instrument, such as a magnetic compass or sun compass, to determine the direction of the luminary; a GNOMON.

RESIDUALS

The remaining deviation of a magnetic compass on various headings after adjustment or compensation.

EKMAN CURRENT METER

A mechanical device for measuring ocean current velocity which incorporates a propeller and a magnetic compass and can be suspended from a moored ship.

DEVIATION TABLE

A table of the deviation of a magnetic compass on various headings, magnetic or compass. Also called MAGNETIC COMPASS TABLE. See also NAPIER DIAGRAM.

RESIDUAL DEVIATION

Deviation of a magnetic compass after adjustment or compensation. The values on various headings are called RESIDUALS.

HEELING ERROR

The change in the deviation of a magnetic compass when a craft heels, due to the change i

COEFFICIENT D

A component of magnetic compass deviation, varying with the sine function of twice th

TMC

Transmitting Magnetic Compass

INDUCED MAGNETISM

The magnetism acquired by soft iron while it is in a magnetic field. Soft iron will lose its induced magnetism when it is removed from a magnetic field. The strength and polarity of the induced magnetism will alter immediately as its magnetic latitude, or its orientation in a magnetic field, is changed. The induced mag- netism has an immediate effect upon the magnetic compass as the magnetic latitude or heading of a craft changes.

Related questions

MarineProHelp 2018.