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PLOTTING RADIOLOGICAL FALLOUT AREAS - CONTINUED
Figure 5-7.Zone I downwind distance nomogram

Aerographers Mate, Module 02-Miscellaneous Observations and Codes
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Figure 5-6.—Ship’s fallout template—a clear plastic template used to plot fallout diagrams on any scale chart. marks on the underlying chart. Unlike the Land Fallout Templates, the semicircles upwind of GZ on the Ship’s Fallout Template do not refer to specific weapon yields, but only serve as an aid in plotting. The 20° radial lines to  the  left  and  right  of  the  downwind  axis  are  not provided with units of measurement. In addition, since geographical  charts  used  at  sea  are  not  uniformily scaled, the Ship’s Fallout Template is unscaled. To use the Ship’s Fallout Template, follow the steps outlined below. 1.  Draw  Grid  North  (downwind  direction  for appropriate  weapon  yield  from  NAV  EDM)  on  the template  from  ground  zero.  Grid  North  is  determined from a NAV NBC 3 NUC message by averaging the left and right radials from element "Y" of the message. 2.  Plot  the  downwind  distance  to  Zone  I  from element "Z" of the message or use the nomogram (fig. 5-7)  to  determine  the  downwind  distance  to  Zone  I. Double  the  distance  to  determine  Zone  II.  Draw  two arcs between the radial lines. 3.   Determine the cloud radius from the Ship’s Fall- out    Template using the appropriate yield group from the NAV EDM.   Element "Z" of a NAV NBC 3 NUC message will contain more accurate cloud radius data. 4.   From the intersections of the Zone I arc with the radial lines, draw two more lines to connect the cloud radius circle. 5.   To determine the area where deposition of fall- out is estimated to take place at a specific time, simply multiply the effective downwind speed by the time (in hours). Draw an arc between the two radial lines at the distance   calculated.   For   example:   10   knots   x   1.25 hours is 12.5 NM. 6.   Add   and   subtract   the   safety   distance   as determined  from  the  Ship’s  Fallout  Template  for  the 5-7







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