To compute sound focus, you will need air tem-peratures and wind velocities at roughly 500-foot intervals up to an altitude of approximately 5,000 feet (850 millibars). This information is taken

from an atmospheric sounding and placed on a sound focus wind-speed worksheet. 

NOTE: Interpolation of pressure, temperature, wind direction, and speed may be necessary between the mandatory/significant levels. 

In addition to the sounding and worksheet, two other items are necessary: a geographical map or chart of the area of interest, and an Atmospheric Speed Of Sound Calculator and Plotting Diagram.

An aircraft navigational chart of the area of interest is ideal for the purpose of computing sound focus. The chart is used to locate the point of detonation, and to determine distances and azimuths to areas or points of concern.

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