Quantcast How  to  Perform  Compass  Calculations - 14220_70

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Exercises - 14220_71
How  to  Perform  Compass  Calculations Preforming Calculations The  following  table  will  allow  you  to  visualize  the  steps  necessary  to perform  compass  calculations.  The  table  is  followed  by  several example  exercises  that  should  be  completed  before  you  move  on  to additional  material. Step Action 1. Write  down  the  first  letters  from  the phrase  "Can  Dead  Men  Vote  Twice." Ordered  course  is  180°T;  you  want  to 2. find  the  compass  course  to  steer.  You already  know  what  T  is,  so  write  it down. 3. Let’s  say  that  the  corrected  variation from  the  center  of  the  compass  rose  is 11°E. 4. When  uncorrecting,  remember  that you  add  westerly  errors  and  subtract easterly  errors.  The  variation  is easterly,  so  subtract  it  from  the  true heading  to  find  the  magnetic  heading. Next,  from  the  deviation  table,  figure 5. 2-8,  find  the  value  closest  to  169°, interpolating  as  necessary;  write  it down. 6. Remember,  when  uncorrecting  you add  westerly  errors.  15  +  169  =  184. Closing Now  you  can  see  that  to  head  180°  true,  you  must  steer  184°  by  this particular  magnetic  compass.  In  this  example,  we  were  uncorrecting (changing  from  true  to  compass).  We  could  have  used  the  same  method to  change  from  compass  to  true;  but  we  must  remember  that  when correcting,  we  add  easterly  and  subtract  westerly  errors.  With  an understanding  of  these  rules,  we  can  now  go  on  to  applying  the  lessons learned  to  a  functional  part  of  a  Quartermaster’s  job—recording  entries in  the  Magnetic  Compass  Record  Book.  But  first,  complete  the  training examples  on  the  next  page. 2-16

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