How to make Gyro North Seeking

• The requirement of Gyro is that it must settle down and maintain a fixed direction with respect to earth. This settling position should be such as that if the gyro is disturbed, it must return back to the direction. To have this we must control the gyro and make it North seeking. 

• In general, it is done by creating a torque about the horizontal East-West axis, which produces a precession in azimuth, and cause the spin axis to seak the meridian. 

• The control weight (top/bottom heavy effect) causes the spin axis to process North end to westward when that end is tilted above the horizontal and North end to Eastward when tilted below the horizontal.