Gyro Compass
A Gyro Compass is a kind of compass used at the time of a sea voyage. Unlike ordinary compasses, a gyromagnetic compass does not get affected by an external magnetic field. It automatically finds a geographical direction based on the rotation of the earth. These compasses have two main advantages over magnetic compasses. Firstly, they find the true north which is more useful than the magnetic north for navigation. Secondly, they are not affected by other ferromagnetic material like the parts of the ship.