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PLOTTING CHEMICAL CONTAMINATION  DATA
SUMMARY - 14270_116

Aerographers Mate, Module 02-Miscellaneous Observations and Codes
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ground  forces,  and  a  maximum  of  15-nautical-mile radius for Naval Forces. From  the  NAV  NBC  3  CHEM  message,  element FOXTROT, locate and mark the attack coordinates on your chart. Using a compass, set the distance between the points to 30 seconds of latitude (1/2 nautical mile), and draw a circle of this radius around the detonation point,  Label  the  area  within  this  circle  "A,"  for  the attack  area.  Then  set  the  compass  spacing  to  15 minutes of latitude. and draw a second circle with that radius  around  the  detonation  point. Label  the  area within this circle as "H," for the hazard area. Near the circle, you should note the attack serial number and the date-time   of   the   attack.   The   NAV   NBC   3   CHEM message should either be kept with the chart or all of the  other  information  should  be  noted  on  the  chart (fig. 5-11). Triangular  Hazard  Area When the winds are greater than 5 knots in a type A- case (b) or type B-case (a) or case(b) attack, the plotted hazard area will generally be a triangular pattern with a circular attack area at the apex. The area is plotted as follows: 1. From the NAV NBC 3 CHEM message, locate the detonation point and mark this on your chart. 2. Now draw a light line through the point in the direction  given  by  the  chemical  downwind  direction (element  YOKE).  The  line  should  extend  through  the point  for  just  over  1  nautical  mile  in  the  upwind direction and up to 27 nautical miles in the downwind direction,  as  long  as  the  downwind  hazard  distance (DHD). 3.  From  element  ZEBRA-BRAVO,  obtain  the DHD.   Measure   the   DHD   from   the   center   of   the detonation  downwind  on  the  CDD  line,  and  mark  the distance on the line. 4. Now use a compass to draw a 1/2 nautical mile radius  circle  around  the  detonation  point  for  either  a type  A,  case  (b)  or  a  type  B,  case  (a)  attack,  or  a  1 nautical mile radius circle for a type B, case (b) attack. Label the area within the circle "A," for attack area. 5.  From  element  ZEBRA-BRAVO,  determine  the half-sector  angle  (HSA).  If  not  given,  the  HSA  is  30 degrees. Using a protractor on the segment of the CDD line on the upwind side of the detonation point, and the HSA angle, draw two radial lines tangent to the attack area boundary circle: one at the HSA angle to the left of the CDD line, the second at the HSA angle to the right of the CDD line (fig. 5-12). 6.   Now draw a line perpendicular to the CDD line at the downwind hazard distance (DHD) marked earlier. 7.  Label  the  triangular  area  extending  downwind from the attack area as "H," for hazard area. 8. Transfer all information from the NAV NBC 3 CHEM message to the chart. NOTE:  Instead of using a protractor to measure the HSA  angles,  you  may  construct  a  reusable  template with 20-, 30-, and 35-degree HSA angles. Instructions for construction and use of the template are provided in the ATP-45. Double-Triangular Hazard Area When chemical contamination is dispersed over an elongated area, such as would occur during an aircraft spray attack, the resulting hazard area is plotted as two connected  triangular  areas.  In the case of an aerial spray attack,  it  is  assumed  that  the  width  of  attack  area  is greater  than  2  kilometers  (1  nautical  mile)  wide. Normally, only ground-contaminating agents are used with  an  aerial  spray. Once  the  agent  settles  on  the ground, the vapor released by the liquid or solid agent drifts   downwind.   This   hazard   area   is   normally associated with a type B-case (c) chemical attack. When the attack location is provided as a series of coordinates in element FOXTROT, or two coordinates Figure 5-12.—Triangular hazard area. Plotted type A-case (b)  chemical  attack. 5-15







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