DMA Stock Numbering System
A five-digit alphanumeric series designator prefix has been assigned to
each standard nautical chart number (fig. 1-16). The purpose of this
prefix is to speed up requisition processing and to improve inventory
management by the DMA. It is listed in the lower left-hand comer of
many charts, along with the chart edition number and date.
As illustrated in figure l-16 the first two digits of the prefix reflect the
geographical subregion in the same manner as the first two digits of the
basic chart number. The third position is the portfolio assignment, A or
B. X is used if the chart is not included in a portfolio. The fourth and
fifth positions are alphabetical designators for the type of chart.
Figure 1-16. DMA stock numbering.