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Chapter 8 Dead Reckoning, Piloting, and Electronic Navigation Introduction In  this  chapter,  you  will  learn  how  to  keep  track  of  the  ship’s  position. It  is  extremely  important  that  the  QMOW  be  able  to  quickly  estimate  the ship’s  position  at  any  time.  Dead  reckoning  (DR)  is  one  of  the  most basic  and  widely  used  methods  of  navigating.  Dead  reckoning  is  always employed  any  time  a  vessel  is  under  way. The  primary  reason  for  using  dead  reckoning  is  that  the  navigator  may at  any  time  give  a  reasonable  account  of  the  ship’s  position  without having  to  take  sights  or  obtain  a  position  from  other  means.  In  many places  on  Earth,  a  vessel  may  get  beyond  the  range  of  today’s sophisticated  navigational  aids  and  have  to  rely  on  methods  as  old  and time  tested  as  the  DR.  Many  vessels  have  been  under  way  for  weeks  at a  time  without  having  made  a  landfall  or  having  any  other  contact  with shore  and  have  still  come  within  a  very  few  miles  of  the  desired destination  using  only  a  carefully  maintained  DR  plot. The  practice  of  maintaining  a  DR  plot  will  be  the  first  task  we  focus  on in  this  chapter.  Piloting  will  be  the  second  main  focus  of  this  chapter. Perhaps  you  recall  from  chapter  1  that  the  QM  uses  visual  aids  to establish  the  ship’s  position  when  piloting.  Electronic  navigation  uses several  pieces  of  electronic  equipment.  State  of  the  art  equipment  is often  used.  Currently,  the  Navy’s  cutting  edge  electronic  navigation equipment  is  the  WRN-6  Satellite  Navigation  Set. Objectives The  material  in  this  chapter  will  enable  you  to: Identify  the  primary  reason  for  using  dead  reckoning,  and  match plotting  instruments  and  tools  with  their  usages. State  how  you  obtain  true  or  magnetic  course  using  the  compass rose. State  the  purpose  of  a  course  line,  and  identify  the  proper  method  of labeling  course  lines. State  the  two  factors  considered  when  using  the  dead  reckoning process. Match  the  plotting  symbols  with  their  appropriate  meaning:  DR,  EP, visual  fix,  and  electronic  fix. Calculate  speed,  time,  and  distance  problems  using  the  formula  D  = S  x  T,  the  nautical  slide  rule,  and  the  3-minute  rule. List  three  methods  used  to  measure  a  ship’s  speed  through  the  water, 8-l

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