the explosive noise prediction plot. Output from this program  consists  of  an  explosive  noise  prediction  plot that shows expected noise (dB) against range, sound speed profiles (total sound speed and speed due to wind) in the direction of interest with respect to height. Figure 7-7 shows an example of a tabular output of maximum subsonic aircraft ground speeds with respect to height. For instance, an aircraft flying at 681 knots at 5,000 feet with a tailwind, the explosive noise source would be 337° (relative) from the aircraft. LASER  RANGE  PREDICTION (LRP) LEARNING  OBJECTIVES:  Interpret  LRP displays  for  low-level  laser  radiation.  Identify limitations  and  assumptions. The LRP displays range information for exposures to low-level laser radiation, both height vs. range and by differences  between  day  and  night  conditions.  The program also displays range vs. time of exposure for different  levels  of  exposure  to  laser  radiation. APPLICATION LRP  produces radiation that could crewmembers  in  the ranges  for  exposures  to  laser be  hazardous  to  aircraft  pilots  or line of sight of this radiation. LIMITATIONS AND ASSUMPTIONS The restrictions as well as the principles taken for granted in using the LRP program are as follows: .  This  program  operates  on  a  wavelength- specified basis. If the operator selects a wavelength that is available to the program, then the closest wavelength will be run for calculations. l The power is the averaged power for a pulsed laser that pulses over a l-second period. Data-base computations  select  the  pulse  repetition  frequency  for maximum power of a particular  radar. l No power increase is taken into account in the calculations for the displays due to magnification effects (for  example,  binoculars). . The vertical extent of the transmission models is 7 km in height for gaseous components and 2 km for aerosol  components  in  the  selected  environment.  This limits  surface-to-surface  results  and  possible  outputs  to other  displays. . The Night/Day display assumes one set of eye apertures for the night/twilight/day exposures. . This program is not to be applied to air-to-air cases  since  the  variation  of  the  atmosphere  with  height will  effectively  change  the  resultant  ranges. FUNCTIONAL DESCRIPTION The operator specifies a set of laser parameters or selects a laser from the laser database. The atmosphere and environment are then specified by the operator. Output  from  this  program  is  classified  and  should  be labeled as required. BALLISTICS WINDS AND DENSITIES CORRECTIONS  (BALWND) LEARNING  OBJECTIVES Interpret BALWND  correction  factors  for  U.S.  and NATO  gunfire  support.  Identify  limitations  and assumptions. List  the  types  of  forecast messages produced by the BALWND program. The BALWND program computes ballistic wind and density correction factors for U.S. Navy and North Atlantic Treaty Organization (NATO) gunfire support. Correction factors are produced for the following types of  gunfire:  surface-to-surface  <16-inch,  surface-to-air >16-inch, surface-to-surface 16-inch full charge, and surface-to-surface   16-inch   reduced   full   charge. Ballistic  wind  and  density  correction  factors  are  output in standard U.S. Navy and NATO ballistic message format.  User-specified  input  includes  the  duration  of the   ballistic   forecast   and   a   specification   of   the radiosonde  data  set  to  be  used.  The  user-specified radiosonde data set is retrieved from the EDFs and contains the upper air and upper wind profiles necessary to  produce  a  ballistic  wind  and  density  forecast. APPLICATION Ballistic  correction  factors  are  used  by  gunfire support personnel to correct for current or forecast atmospheric  conditions.   These  correction  factors  are required to obtain close hits with initial firings of naval guns. 7-16