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Figure 5-10.Chemical downwind message
Triangular  Hazard  Area

Aerographers Mate, Module 02-Miscellaneous Observations and Codes
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PLOTTING  CHEMICAL CONTAMINATION  DATA Plotting chemical contamination areas is easy once you understand the terms and the contents of a chemical downwind  message.  Normally.  the  military  grid squares   contaminated   by   a   chemical   weapon   are provided   in   element   PAPA-ALFA   of   the   chemical downwind message. In a NAV NBC 3 CHEM message, the  contaminated  area  boundary  positions  should  be provided  in  degrees,  minutes,  and  seconds  (DMS).  A better  picture  of  the  contaminated  area  is  constructed using other parameters contained in the message. From the  NAV  NBC  3  CHEM  message,  check  element ZULU-BRAVO to determine the type and case of the attack.  Element  ZULU-ALFA  contains  environmental information, and, on occasion, plain language may be used in lieu of the meteorological reporting code. Now let’s  discuss  the  methods  used  to  plot  initial contamination   for   circular,   triangular,   and   double- triangular hazard areas. Circular Hazard Area When winds are 5 knots or less in a type A-case (a) or  a  type  B-case  (a),  case  (b),  or  case  (c)  attack,  the attack  area  is  plotted  as  a  circular  hazard  area.  The important factor is that the prevailing wind speed is 5 knots or less. In both type A-case (a) and type B-case (a) attacks, the attack area is drawn as a 1/2-nautical-mile- radius  (1-kilometer-radius)  circle  around  the  location where the chemical agent was deployed. In a type B- case (b.) attack, the attack area is drawn as a 1/2- to 1- nautical-mile-radius  circle  centered  on  the  attack  site and in a type B-case (c), the attack area is drawn larger than a 1-nautical-mile radius, depending on the type of attack. In all of these situations, the hazard area is a 10- kilometer-radius  circle  around  the  attack  area  for Figure 5-11.—Circular hazard area. Plotted type B-case (a) chemical attack, land. Wind speed 10 KPH/5 kt or less. 5-14







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