compass card

American  

noun

Navigation.

1. a circular card with magnets attached to its underside, the face divided on its rim into points of the compass, degrees clockwise from north, or both, and floating or suspended from a pivot so as to rotate freely.

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compass card British  

noun

1. a compass in the form of a card that rotates so that "0°" or "North" points to magnetic north

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Etymology

Origin of compass card

First recorded in 1870–75

Example Sentences

But they never look at the instrument board on a line run without seeing on the compass card a sharp reminder of a TWA deficiency: all its routes run east and west.

From Time Magazine Archive

I actually prefer trying to hold a number on its screen rather than trying to keep a compass card in alignment.

From Time Magazine Archive

The compass card, probably the most interesting of any found in the wooden instruments, is hand-colored in black, blue, red, and gold.

From Early American Scientific Instruments and Their Makers by Bedini, Silvio A.

Three wooden instruments with his compass card exist in private and public collections.

From Early American Scientific Instruments and Their Makers by Bedini, Silvio A.

The float has mounted upon it a compass card much like that of the ordinary magnetic instrument, and the sailor reads it in precisely the same way.

From Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science by Corbin, Thomas W.