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General Duties of the QMOW, Continued - 14221_370
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Quartermaster 3 & 2 - Military manual for the Quartermaster rate
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General Duties of the QMOW, Continued - 14221_372
General Duties of the QMOW, Continued Allowing  for  Set  and  Drift:  Once  you  have  determined  set  and  drift, you  can  allow  for  it  to  make  your  desired  course  and  speed. Example:  Let’s  assume  that  you  need  to  make  course  265°  and  speed 15  knots  good  to  arrive  at  the  desired  location  on  time.  Set  and  drift  are determined  to  be  185°  at  3  knots.  Use  the  following  table  and  figure 11-9  for  this  example. Step Action 1. From  your  latest  fix  (A),  lay  out  course  and  speed  to  make good (B). 2. From  A,  lay  out  a  line  in  the  set  direction  of  185°  and  the amount  of  drift  of  3  knots  (3  nmi),  which  gives  you  point  C. 3. Determine  the  course  to  steer  by  finding  the  direction  between C  and  B.  This  is  equal  to  276°  in  our  example 4. Determine  speed  necessary  to  make  15  knots  good  by  dividing the  distance  between  C  and  B  by  the  time  of  the  run. Figure   11-9.   Allowing   for   estimated   current. Making Recommend- ations You  now  have  the  knowledge  to  make  recommendations  to  the  OOD. Remember,  after  each  fix  you  should  make  a  report  and  any recommended   course   and   speed   changes   required.   Also,   when maintaining  the  DR  plot,  always  check  to  see  that  new  courses  ordered by  the  conning  are  clear  of  obstructions.  The  OOD  will  often  have  to maneuver  the  ship  to  avoid  other  ships. 11-39

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