They're not - all submarines use both standard and electronic compasses for navigation.
i have a saracom magnetic compass & it has big bubble inside. i have to remove bubble.what type of fluid i have to use, compass make: SARACOM model: MC180
a certain kind of rock called lodestone that pint south because of the magnetic field
A compass is a simple device which consists of a small, lightweight magnet which is balanced on a nearly frictionless pivot point. A compass will always point towards the North Pole because of the Earthâ??s magnetic field because the magnet inside the compass is drawn to that magnetic field.
Then the compass would react according to the magnetic field of the magnet.Then the compass would react according to the magnetic field of the magnet.Then the compass would react according to the magnetic field of the magnet.Then the compass would react according to the magnetic field of the magnet.
Thepermanent and atemporary magnet.
Usually by inflating bags that have been placed inside the submarine.
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.
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.
a needle
Actually no. Magnetic north shifts over time. It has to do with the rotation of the liquid iron inside the earth. I can't remember the exact number but I think you can estimate true north by adding 5 degrees to your compass.
The object used to view the outside from inside the submarine is called a periscope.
It is inside the same part that displays the compass direction.