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Practical  Application - 14220_72
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Quartermaster 1 & C - Military manual for the Quartermaster rate
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The  Gyrocompass - 14220_74
Magnetic   Compass   Adjustment Background The  magnetic  compass  must  be  adjusted  at  least  once  a  year.  The  process of  adjustment  is  called  "swinging  ship."  This  is  required  as  a  safety precaution;  also  as  the  ship  steams,  its  magnetic  properties  will  change. The  process  of  swinging  ship  is  too  detailed  and  complicated  to  be completely  taught  within  this  training  manual.  As  the  magnetic  compass is  considered  a  piece  of  equipment,  it  is  covered  by  the  Planned Maintenance  System  (PMS).  Training  on  compass  adjustment  is  normally done  by  OJT. Basics Closing ANSWERS The following table lists the basic steps to be followed to adjust a magnetic  compass.  It  cannot  be  used  solely  as  a  guide  for  compass adjustment. Rule:    When  performing  actual  adjustment,  you  must  use  the  PMS  card and publication 226. Step Action 1. Meet with the navigator to schedule PMS. 2. Twenty-four  hours  prior,  inform  QM  gang  of  intentions. 3. Four  hours  prior  review  MRC;  gather  all  tools. 4. Four  hours  prior,  calculate  the  true  courses  to  steer. 5. Man all stations and begin swinging ship. 6. Fill out a new magnetic compass deviation table. 7. Have the new table signed by the commanding officer. The  process  of  swinging  ship  is  often  tedious  and  very  time  consuming. In  most  cases  a  minimum  of  4  hours  should  be  set  aside  for  this  task.  It is not advisable to attempt to adjust a compass in moderate to heavy weather.  Doing  so  will  often  render  the  results  inaccurate. EX 1; 020; 088.5, 091.5; 211.5, 8.5 E; 3.0 W, 7.0 E. EX 2; 4.0 W, 3.0 E, 2.0 E, 1.5 E. 2-19

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