The instrument panel is fitted with an airspeed indicator, altimeter and vertical speed indicator, a magnetic compass, turn indicator, ignition switch and fuel pump.
en.wikipedia.org Large ships typically rely on a gyrocompass, using the magnetic compass only as a backup.
en.wikipedia.org There was an automatic pilot function driven by either gyrocompass or magnetic compass as the input heading source.
en.wikipedia.org The nature of the instrument and the alignment of the magnetic pole of the earth cause the magnetic compass to have several significant limitations when used for navigation.
en.wikipedia.org These included cast iron, the ploughshare, the stirrup, gunpowder, printing, the magnetic compass and clockwork escapements, most of which were thought at the time to be western inventions.
en.wikipedia.org