Quantcast Chart Correction Techniques - 14221_51

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Chart Card Maintenance, Continued - 14221_50
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Chart Correction Techniques, Continued
Chart Correction Techniques Background Information After  a  little  practice  on  obsolete  charts,  corrections  to  printed information  on  nautical  charts  can  be  made  neatly  and  quickly.  These corrections  become  a  permanent  part  of  the  chart  and  may  involve  the safety  of  the  ship.  Corrections  must  be  made  in  ink  so  they  will  not  be accidentally  erased  when  you  are  cleaning  the  chart  after  use.  The  only instruments  necessary  to  correct  charts  are  several  high-quality  ball-point pens  or  central  feed  technical  fountain  pens,  a  variety  of  stick  or pencil-type  erasers,  and  typographical  correction  fluid. Correction Techniques Example:  The  NTM  states  that  you  are  to  add  a  buoy  at  25°10'33"N 70°21'12"W.  Locate  the  coordinates  on  the  chart,  determine  if  you  need to  erase  part  of  the  chart  to  insert  the  buoy.  If  necessary  erase  or  use typing  correction  fluid  (white  out).  NOTE:  Any  information  that  is removed  from  a  chart  must  be  redrawn  after  the  correction  is  made. This  calls  for  the  person  effecting  the  correction  to  use  some  degree  of judgment. Use  the  chart  correction  template  (fig.  1-22,  available  from  DMAHTC) to  draw  the  buoy  on  the  chart.  Write  in  any  information  about  the  buoy. Chart  correction  may  be  completed  in  many  ways.  It  is  wise  to purchase  additional  templates  from  local  sources  that  carry  drafting supplies.  As  a  rule,  corrections  must  always  be  neat  and  legible.  Never use  red  ink  to  make  corrections  to  a  chart.  The  Navy  uses  red  lighting at  night.  Red  ink  will  disappear  under  red  lights,  making  the  correction invisible  and  putting  the  ship  at  risk.  DO  NOT  USE  RED  INK! l-35

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