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Magnetic  Compass  Operation  and  Components - 14221_61
Standard  and  Steering  Compasses Compasses The  Chief  of  Naval  Operations  requires  that  each  self-propelled  ship  and are service  craft  of  the  United  States  Navy  be  equipped  with  one  or  more REQUIRED magnetic  compasses  suitable  for  navigation. Except  for  modern  nuclear-powered  submarines,  all  ships  and  craft, regardless  of  size  or  classification,  must  have  a  magnetic  steering compass  at  the  primary  steering  station. Steering Compass Many  ships  carry  more  than  one  magnetic  compass.  The  primary magnetic  compass  is  called  the  steering  compass.  It  is  normally  located on  the  centerline  in  the  ship’s  pilothouse  (except  aboard  aircraft carriers),  where  it  can  best  be  seen  by  the  helmsman.  The  readings  from the  steering  compass  are  labeled  "per  steering  compass"  (PSTGC). Standard Compass If  a  ship  has  two  magnetic  compasses,  the  second  compass  is  called  the standard  compass.  The  ship’s  standard  compass  is  normally  located  on the  ship’s  centerline  at  the  secondary  conning  station.  The  readings  from the  standard  compass  are  expressed  as  "per  standard  compass"  (PSC). Note The  readings  from  the  ship’s  gyrocompass  are  "per  gyrocompass" (PGC).  Courses  and  bearings  by  these  compasses  must  be  carefully differentiated  by  the  abbreviations. Cautions A  magnetic  compass  cannot  be  expected  to  give  reliable  service  unless  it is  properly  installed  and  protected  from  disturbing  magnetic  influences. Certain  precautions  must  be  observed  in  the  vicinity  of  the  magnetic compass. If  possible,  a  compass  should  not  be  placed  near  iron  or  steel equipment  that  will  be  moved  frequently.  Thus,  a  location  near  a gun,  boat  davit,  or  boat  crane  is  not  desirable. The  immediate  vicinity  should  be  kept  free  of  sources  of  magnetism, particularly  those  of  a  changing  nature. When  possible,  no  source  of  magnetism  should  be  permitted  within  a radius  of  several  feet  of  the  magnetic  compass. 2-6

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