An aircraft compass consists of an inverted bowl with a magnetized bar attached.

You will find that the normal aircraft compass is quite useless unless you are flying straight and at a steady speed.

The calibration of aircraft compasses was an important task, closely linked to the provision and updating of the maps used.

In aviation, aircraft compass turns are turns made in an aircraft using only a magnetic compass for guidance.

Among the items produced were amplifiers, spark-gap transmitters, aircraft compasses, high-voltage generators, bomb release apparatus, and fuses for artillery shells and bombs.

During World War II, Victor manufactured an aircraft compass, a B-24 bomber turret gunsight, and the Norden bombsight.

Two plane crashes on the Hill of Pines, less than 600 feet (180 m) apart, are believed to have occurred because of the mineral's influence on the aircraft compasses.

In 1909, Captain F.O. Creagh-Osborne, Superintendent of Compasses at the British Admiralty, introduced his Creagh-Osborne aircraft compass, which used a mixture of alcohol and distilled water to damp the compass card.