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Terms Associated with the DR Plot - 14220_208
The DR Plot General Information The  importance  of  maintaining  an  accurate  dead  reckoning  plot  cannot be  overemphasized.  Since  other  means  of  fixing  your  ship’s  position may  not  always  be  available,  a  navigator  must  rely  on  a  DR  plot. If  a  ship  made  good  the  exact  course  and  speed  ordered,  and  there  was no  wind  or  current,  dead  reckoning  would,  at  all  times,  provide  an accurate  indication  of  the  ship’s  position.  A  navigator  must  know  the position,  or  approximate  position,  to  determine  when  to  make  changes  in course  and/or  speed,  to  predict  the  time  of  sighting  lights  or  other  aids  to navigation,  and  to  identify  landmarks. Rules When  maintaining  a  DR  plot,  there  are  six  rules  that  govern  what actions  the  QM  should  take.  These  rules  are  not  subject  to interpretation,  they  are  hard  and  fast.  Often,  when  the  ship  is  changing course  it  becomes  tedious  to  maintain  the  DR  plot.  This  is  a  given  and known  fact;  however,  the  importance  of  keeping  the  plot  up  to  date  can’t be  stressed  enough. These  rules  specify  when  a  DR  position  shall  be  plotted: # Rule 1. A  DR  position  shall  be  plotted  each  hour  on  the  hour. 2. A  DR  position  shall  be  plotted  at  the  time  of  every  course change. 3. A  DR  position  shall  be  plotted  at  the  time  of  every  speed change. 4. A  DR  position  shall  be  plotted  at  the  time  of  a  fix  or  running  fix. 5. A  DR  position  shall  be  plotted  at  the  time  of  obtaining  a  single LOP. 6. A  new  course  line  shall  be  plotted  from  each  new  fix  or  running fix. 8-3

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