compass card

compass card

noun Navigation.
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.

Origin:
1870–75

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World English Dictionary
compass card
 
n
a compass in the form of a card that rotates so that "0°" or "North" points to magnetic north

Collins English Dictionary - Complete & Unabridged 10th Edition
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