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Page Title: The Nautical Chart Numbering System, Continued
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The Nautical Chart Numbering System, Continued Note Number  of  Digits Scale Description 5   (11000-99999)   Larger   than In  this  category  are  all  standard 1:2,000,000 nautical  charts  at  a  scale  larger than  1:2,000,000.  At  scales  such as  this,  the  charts  cover  portions of  the  coastline  rather  than significant  portions  of  ocean basins. 6 (800000-809999) This  category  consists  of  combat charts  and  combat  training  charts. A  random  numbering  system  is used  to  prevent  the  identification of  the  geographical  area  covered by  a  classified  combat  chart without  referring  to  the  catalog. One  reason  for  this  is  to  allow  you to  order  classified  combat  charts with  an  unclassified  requisition. The  five-digit  category  contains  all  the  large-scale  and  medium-scale charts  of  the  world.  These  are  the  primary  nautical  charts.  The five-digit  charts  are  based  on  the  nine  regions  of  the  world,  as  shown  in figure  1-15.  The  first  of  the  five  digits  indicates  the  region  in  which  the chart  is  depicted.  The  first  and  second  digits  together  indicate  the geographic  subregion  within  the  region,  and  the  last  three  digits  identify the  geographic  order  of  the  chart  within  the  subregion. 1-27

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