What type of compass ships and airplanes use?

Answer 1

Both aircraft and ships use both magnetic and gyro-type compasses. it is a tradition if not a law that both types be carried. The Gyro-direction indicators in light planes has to be recalibrated periodically during maneuvers, this does not apply to the magnetic type. Ships, also use both types. Some harbor or coastal types use ONLY the traditional counter-weighted ( to even out the magnetic influence of the hull) Magnetic compass such as traditional Staten Island Ferries. A Magnetic compass goes well with with a fine, Mahogany helm on a brass steering stand!