(nautical) The process of swinging and compensating a ship or aircraft compass by determining and reducing the deviation coefficients and recording the residual deviations; now done by computer.

(nautical) To know, and demonstrate by reciting, the 32 points and quarter points of the magnetic compass from North or East, both clockwise and anticlockwise.

A gyrocompass.

(navigation) A graduated circle, usually marked in degrees, indicating directions and printed or inscribed on an appropriate medium.

(military, nautical) An instrument containing a freely suspended magnetic element which displays the direction of the horizontal component of the Earth’s magnetic field at the point of observation.

(geometry, geomagnetism) The combination of variation and deviation which is the horizontal angle between the direction indicated by a magnetic compass and true north.

(nautical) A compass installed in the cabin so that the captain or other officer may check the course of a ship without going to the deck; often upturned and suspended from the ceiling.

A compass, equipped with a small prism, that allows the heading to be read while sighting

Third-person singular simple present indicative form of box the compass

simple past tense and past participle of box the compass