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Magnetic   Compass   Adjustment - 14220_73
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Repeaters - 14220_75
The  Gyrocompass Introduction The  gyrocompass  was  developed  as  the  answer  to  the  need  for  an instrument  that  would  indicate  TRUE  NORTH  rather  than  MAGNETIC NORTH.  The  gyrocompass  is  now  the  main  source  for  determining direction. Operation The  basis  for  the  gyrocompass  is  the gyroscope.  A  rapidly  spinning  body having  three  axes  of  angular  freedom constitutes  a  gyroscope.  This  may  be illustrated  by  the  heavy  wheel  rotating  at high  speed  in  supporting  rings  or gimbals. The  gyrocompass  must  be  lit  off  a minimum  of  4  hours  prior  to  use.  This allows  the  gyro  to  warm  up  and  settle. It  is  desirable  to  lite  off  the gyrocompass  24  hours  prior  to  the scheduled  underway  time. Figure   2-11.   Gyroscope. Components The  gyrocompass  is  powered  by  electricity  and  consists  of  two  main components. They  are  the  master  gyro  and  repeaters.  The  master gyrocompass  consists  of  a  control  cabinet,  power  supply,  speed  unit, alarm  unit,  and  transmission  units.  It  is  normally  located  within  the ship’s  hull  where  it  is  least  affected  by  pitch,  roll,  yaw,  and  battle damage.  The  IC  electricians  are  responsible  for  its  upkeep. Accuracy A  properly  functioning  gyrocompass  will  often  have  a  mechanical  error of  2°  or  less.  The  gyrocompass  must  be  checked  for  error  at  least  once daily  while  the  ship  is  under  way. 2-20

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