GYROCOMPASS

Introduction:
                        A compass with a motorized gyroscope whose angular momentum interacts with the force produced by the earth's rotation to maintain a north-south orientation of the gyroscopic spin axis, thereby providing a stable directional reference.

 

Description:                                     
                             A gyrocompass­ (less often spelled gyro-compass­ or gyro compass​) is a type of non-magnetic compass which is based on a fast-spinning disc and rotation of our planet to automatically find geographical direction. Although one important components of a gyrocompass is a gyroscpe, these are not the same devices; a gyrocompass is built to use the effect of gyroscopic precession, which is a distinctive aspect of the general gyroscopic effect. Gyrocompasses are widely used for navigation on ships, because they have two significant advantages over magnetic compass.
1.They find true north as determined by Earth's rotation, which is different from, and navigationally more useful than, magnetic north and
2.They are un affected by ferromagnetic materials,such as ship's steel hull, which change the magnetic field.