compass correction card

compass correction card

[′käm·pəs kə′rek·shən ‚kärd]
(navigation)
A card posted in a holder near the magnetic compass, on which there is recorded the difference between the readings of the compass and the correct geomagnetic directions; these errors (deviations) are given for at least the four cardinal points; sometimes the card lists the compass bearings to be flown when it is desired to fly corresponding magnetic headings.

compass correction card

compass correction card
Compass correction/deviation card.
A small card placed in the cockpit to show the compass deviation for each heading. The card reads the courses to be steered in lieu of the required headings. Also called a deviation card.