Quantcast Magnetic  Compass  Deviation  Tables - 14220_64

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Magnetic  Compass  Error - 14220_63
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How  to  Determine  Deviation - 14220_65
Magnetic  Compass  Deviation  Tables Purpose The  purpose  of  the  magnetic  compass  deviation  tables,  commonly refered  to  as  "deviation  tables,"  is  to  provide  a  means  of  knowing  the deviation  of  the  magnetic  compass  for  any  heading.  This  information  is crucial  to  safe  navigation  if  the  gyrocompass  fails. Table Composition The  figure  on  the  right  is  an example  of  a  deviation  table.  The top  portion  of  the  table  contains  the name  of  the  ship,  location  of  the compass  (pilothouse),  binnacle  type, and  compass  type. The  middle  section  of  the  table contains  the  ship’s  heading  and deviation  data. Example:  You  want  to  steer  course 090°  magnetic.  By  inspecting  the table  for  ship’s  heading  090°,  you’ll notice  that  the  deviation  is  equal  to 1.0°  West  with  DG  OFF  (DG  is  an abbreviation  for  degaussing)  and 1.5°  West  with  DG  ON.  To  make good  090°,  you  would  have  to actually  steer  course  091°. The  bottom  portion  of  the  table contains  information  on  magnet  and flinders  bar  placement  that  corrects for  excessive  deviations. Figure  2-8.  Magnetic  compass deviation  table. 2-10

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