Small units (companies, troops, or batteries) should appoint and train

specific personnel within the unit to collect nuclear burst data. Data

obtained by these individuals is used by the unit for estimates of the

situation and for simplified fallout predictions until evaluated data is

received. The data collected by small units is not reported to higher

headquarters unless specifically requested.

Using the reported information, the location of GZ can be determined by

several different methods.

GZ will normally be determined by the

intersection of azimuths from two or more observations points reporting

on the same nuclear burst.

Other methods also can be used.

The

different methods of locating GZ are:

Intersection of two azimuths, (Figure 1-1)

Intersection of more than two azimuths, (Figure 1-2)

One observer reporting azimuth and flash-to-bang time, Polar

Plot, (Figure 1-3)

Intersection of two flash-to-bang times, (Figure 1-4)

Intersection of an azimuth and a flash-to-bang time arc,

(Figure 1-5)

To determine the location of GZ using this method the position of the

observers and the azimuths from their position are plotted on the

situation map. GZ is determined to be the point on the map where the two

azimuths intersect.

azimuth to the nuclear cloud of 35 Grid. Observer B, located at

coordinates 157220, reported a measured azimuth of 340 Grid.

To

determine the location of ground zero, follow the step-by-step procedures

in Figure 1-1.

Plot observer A's location at coordinate 105240.

From observer A's location, draw a line on an azimuth of

35 Grid.

Plot observer B's location at coordinate 157220.

From observer B's location, draw a line on an azimuth of

340 Grid.

Where the lines intersect at coordinate

133280 is determined to be ground zero.