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The DR Plot - 14220_207
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Quartermaster 1 & C - Military manual for the Quartermaster rate
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Time, Speed, and Distance - 14220_209
Terms Associated with the DR Plot Definition Table Use  the  following  table  to  identify  and  learn  the  meanings  of  terms associated  with  DR: Term Definition Heading The  ship’s  heading  is  always  expressed  in  degrees measured  clockwise  from  000°  through  360°.  Commonly referred  to  as  the  ship’s  head,  the  heading  can  be referenced  from  true  north,  magnetic  north,  or  compass. The  ship’s  head  is  always  changing  due  to  the  constant yawing  motion  caused  by  the  effects  of  the  sea  and steering  errors. Course The  course  is  the  direction  on  which  the  ship  is  to  be steered.  As  an  example,  the  helmsman  is  ordered  to  come left  steer  new  course  090°  T  .  The  helmsman  would respond  by  putting  the  rudder  left  and  steadying  the  ship on  new  course  090°T. Course  Line The  course  line  is  the  graphical  representation  of  the course  that  is  being  steered  laid  on  to  the  chart.  Looking back  at  our  example,  let’s  assume  the  original  course  was 094°T.  The  chart  would  have  had  a  094°T  course  line laid  on  it.  When  the  helm  was  ordered  to  steer  090°T,  a new  course  line  of  090°T  would  be  laid  on  the  chart. Speed This  is  the  ship’s  ordered  speed.  For  example,  let’s assume  that  ordered  speed  is  12  knots.  For  purposes  of DR,  we  assume  that  the  ship  will  travel  12  nautical  miles in 1 hour DR Position This  position  is  determined  by  laying  out  the  ship’s  course (course  line)  and  speed  on  the  chart.  A  DR  position  does not  take  into  account  any  current  that  may  speed  or  slow the ship. Estimated This  is  a  best  guess  position  using  available  information. Position In  practical  usage,  it  starts  with  the  DR  position  and  adds other  data  such  as  the  estimated  speed  and  set  of  the current. Fix This  position  is  established  at  a  specific  time  that  is believed  of  high  accuracy.  With  the  recent  addition  of Global  Positioning  System  (GPS)  WRN-6  satellite  fix data,  it  is  now  possible  to  obtain  a  highly  accurate  fix  24 hours a day. 8-4

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