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General Duties of the QMOW, Continued - 14221_368
General Duties of the QMOW, Continued Using All It  is  important  to  use  all  methods  available  to  fix  the  ship’s  position. Available  Means   The  navigator  is  required  by  instruction  to  fix  the  ship’s  position  by  all to  Determine Position available  means.  You  as  the  QMOW  must  make  every  effort  to accomplish  this.  In  actual  situations,  you  will  often  use  a  combination of  methods  to  determine  the  ship’s  position.  If  transiting  along  a coastline  and  visual  or  radar  fixes  are  available,  use  them!  In  the following  list  you’ll  find  methods  of  fixing  the  ship’s  position  listed  by accuracy,  from  the  most  accurate  to  the  least  accurate: A  visual  fix  on  three  objects  120°  apart A  visual  fix  on  two  objects  90°  apart An  electronic  fix  by  GPS  in  the  encrypted  mode A  visual  bearing  and  radar  range  on  one  object A  radar  fix  using  three  range  arcs  on  objects  120°  apart A  radar  fix  using  two  range  arcs  on  objects  90°  apart An  electronic  fix  by  the  AN/SRN  12  SATNAV An  electronic  fix  by  LORAN Approaching Land When  approaching  land  from  the  open  ocean,  the  QMOW  must  start checking  to  see  if  radar  fixes  can  be  obtained.  At  about  25  nm,  the shoreline  will  start  to  become  distinct.  If  sharp  points  of  the  shoreline are  available,  radar  fixes  should  be  obtained.  Radar  fixes  are  used  in addition  to  whatever  means  are  currently  in  place.  In  other  words,  if fixes  were  being  determined  by  GPS,  you  would  continue  to  plot  GPS and  also  plot  radar.  As  the  ship  progresses  toward  land,  visual  fixes would  be  added.  This  process  continues  until  the  ship  enters  restricted waters  and  the  navigation  detail  takes  over  the  watch. During  all  of  this  activity,  you  must  continue  to  maintain  the  DR  plot. As  you  learned  in  chapter  8,  the  DR  plot  must  never  be  neglected  while you  perform  other  tasks.  In  obtaining  a  fix,  you  are  actually  updating the  DR  plot.  You’ll  find  that  as  a  ship  draws  closer  to  land,  changing course  often  becomes  necessary  due  to  shipping  traffic.  This  makes keeping  your  DR  plot  up  to  date  even  tougher.  On  the  open  ocean,  the QMOW’s  ability  is  not  taxed  often;  however,  the  watch  becomes  very busy  when  approaching  land.  Always  make  an  effort  to  be  prepared. Make  sure  that  you  have  the  next  chart  available  and  that  your  books and  logs  are  up  to  date.  If  at  any  time,  you  are  unsure  of  the  ship’s position,  do  not  hesitate  to  contact  your  LPO  or  assistant  navigator  for guidance. 11-35

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