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Labeling the DR Plot - 14220_215
Example of a DR Plot Example Figure  8-4  represents  a  sample  DR  plot.  At  0900  your  ship  departs point  A  en  route  to  point  B  on  course  090°T,  speed  12  knots.  In  this particular  example,  DRs  are  laid  out  every  hour;  you  expect  to  arrive  at point B at 1300. At  1200,  you  obtain  a  fix  which  places  your  ship  180°T,  5  miles  from your  1200  DR  position  (point  X).  If  you  were  to  maintain  your  original course  of  090°T,  you  will  miss  your  destination;  therefore,  a  correction is necessary. Since  time  was  required  to  record  and  evaluate  your  fix  and  to  decide  a new  course  and  speed  to  reach  your  destination  (point  B),  the  change cannot  occur  at  the  1200  fix.  Instead,  you  must  DR  ahead  some  point  in time.  In  this  case,  the  navigator  plots  a  1210  DR  position  based  on  the old,  and  still  maintained,  course  and  speed.  From  here  the  navigator calculates  the  new  course  of  050°  T,  speed  15  knots.  It  is  important  to remember  that  the  course  line  will  continue  in  the  direction  and  speed originally  ordered  during  the  time  spent  obtaining  and  plotting  the  fix and  while  deciding  a  new  course  and  speed. Figure  8-4.  Example  DR  plot. 8-10

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