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They're not - all submarines use both standard and electronic compasses for navigation.

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Q: Why is a magnetic compass useless inside a submarine?
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Does the compass have to have a magnet to work?

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How is a submarine raised?

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Can a solenoid suspended by a string be used as a compass?

A solenoid can be used as a compass when a DC current is going through it because when a current is going through the solenoid, the magnetic field lines are nearly uniform and perfectly parallel inside of it, giving it essentially a north pole and south pole.


Why Instruments with magnetic fields eg a compass should be stored in containers made of steel or iron?

There won't be any (much) net magnetic field inside the metal container. The external field (eg. from the earth) will induce a magnetic dipole in the metal of the container. Insider the container, the external and induced fields will approximately cancel out.


What is the arrow inside a compass called?

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