Meaning of compass card

com'pass card"

Pronunciation: [key]
— Navig. Navig.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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