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DMA Stock Numbering System - 14220_41
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The Nautical Chart Numbering System, Continued - 14220_43
The Nautical Chart Numbering System Background Information DMA  assigns  a  number  to  every  nautical  chart  used  by  the  U.S.  Navy, regardless  of  the  organization  producing  the  chart.  Charts  produced  by the  NOS,  and  charts  of  foreign  governments  are  also  assigned  numbers by  DMA  so  that  they  may  be  filed  in  sequence  with  the DMAHTC-produced  charts.  DMA  charts  have  numbers  consisting  of one  to  five  digits.  The  number  of  digits  generally  indicates  the  scale range,  and  the  number  itself  indicates  the  geographical  area  covered  by the  chart.  The  chart  numbering  system  is  as  follows: Number  of  Digits Scale Description 1 (1-9) None Symbol  and  flag  charts. 2 (10-99) 1:9,000,000 These  charts  depict  a  major and  smaller portion  of  an  ocean  basin  or  a large  area,  with  the  first  digit identifying  the  ocean  basin. 3 (100-999) Between These  are  general  charts  whose 1:2,000,000 numbers  are  based  on  the  nine and ocean basins. 1:9,000,000. 4  (5000-9999) Various This  category  includes  great  circle tracking  charts,  electronic navigation  system  plotting  charts, and  special-purpose  non- navigational   charts   and   diagrams. Four-digit  charts  with  a  letter prefix  (EOIOI-E8614)  are  bottom contour charts. 1-26

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