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Exercises - 14221_71
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Quartermaster 3 & 2 - Military manual for the Quartermaster rate
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Magnetic   Compass   Adjustment - 14221_73
Practical  Application Compass Comparison Whenever  a  ship  is  under  way  it  is  necessary  to  compare  the  ship’s compasses  to  make  sure  that  they  are  operating  properly.  This  is accomplished  by  using  the  compass  calculations  and  checking  the compasses  against  the  true  course. Example The  following  table  represents  an  excerpt  from  the  Magnetic  Compass Record  Book. Date Time Latitude Longitude Gyro  Compasses True Heading ---- Gyro ------Gyro Gyro Error Gyro Error Reading Reading 10Mar94 1000 36°24 W 74°12 W 120 1.0E 121 1012 36 04 W 074 14 W 270 1.0E 271 1025 36 05 W 074 18 W 297 1.0E In  this  example  the  date,  time,  latitude,  and  longitude  of  the  observation are  noted.  The  master  gyro  is  reading  120;  the  error  determined  by  the morning  azimuth  is  1.0  E.  Remember,  if  the  compass  is  least  the  error is  east;  you  would  add  the  error  to  obtain  the  true  heading.  Knowing our  true  heading,  we  can  now  apply  our  variation  and  compare  the magnetic  compasses. Variation Magnetic MagneticCompasses DG Heading ON/OFF REMARKS 14  W 14 W 14.5W 135 285 Standard Steering Compass Dev Compass Reading Reading Dev 136 1W 134 1E OFF 289 4W 283 2E OFF Energized degaussing at 1022 313 311 ON As  you  can  see,  this  is  the  practical  application  of  your  newly  acquired compass  calculation  skills.  Practice  by  filling  in  the  blanks  for  the  1025 entry.  When  under  way,  the  compasses  must  be  compared  every one-half  hour  and  at  each  course  change. Note:  There  is  an  exception;  if  a  ship  is  in  a  formation  and  changing course  frequently,  or  the  ship  is  alongside  another  ship,  each  course change  does  not  need  to  be  recorded.  Use  the  following  statement  in  the Remarks  column:  "Steering  various  courses  while  alongside  (in formation)."  A  comparison  must  still  be  made  every  one-half  hour! 2-18

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