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Compass Error Calculations - 14220_68
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Quartermaster 1 & C - Military manual for the Quartermaster rate
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How  to  Perform  Compass  Calculations - 14220_70
Memory-Aids Information There  are  several  sets  of  "memory-aids"  available  to  assist  you  in performing  compass  calculations.  The  following  simple  phrases  are designed  to  assist  you  in  remembering  how  to  convert  from  one  heading expression  to  another  and  how  to  name  errors. Meanings The  first  set  of  aids  were  designed  to  help  you  remember  the arrangement  of  the  first  letters  of  each  word  in  the  phrase. These  are arranged  representing  the  three  ways  of  naming  a  direction  (compass, magnetic,  true)  with  the  respective  differences  (deviation  and  variation) properly  placed  between  them:  (CDMVT)  compass,  deviation, magnetic,  variation,  true.  The  first  letters  in  the  words  at  elections  stand for  add  east  (subtract  west),  when  converting  the  direction  from  compass to  true.  When  converting  in  the  opposite  direction,  the  letters  are reversed  (TVMDC)  and  the  memory  aid  "timely  vessels  make  distance count  at  war"  informs  us  to  add  west  (subtract  east)  error  when converting  from  true  to  compass. The  second  set  of  memory  aids  deal  with  comparison  of  two  compass headings  to  determine  whether  to  call  the  difference  east  or  west.  If  the comparison  is  between  magnetic  and  compass,  and  compass  is  a  greater number  (best),  the  difference  is  west.  The  same  comparison  can  be made  between  true  and  magnetic.  In  this  case,  magnetic  is  considered the  same  as  compass. Correcting:  converting  from  compass  course  to  a  true  course Uncorrecting:  converting  from  a  true  course  to  a  compass  course 2-15

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