(11) The time in zone is determined from the

travel in meters, *T *is the time in zone in

fixed standards given in column 6 of DA

minutes and tenths, and *S *is the zone

Form 4469.

windspeed in knots. The values of the

windspeed are entered in columns 8 of

(12) Compute the zone windspeed by using

DA Form 4469.

Slide Rule ML-59 and the formula D/T

X0.0324 = S; where *D *is the horizontal

line 1 are the same as the surface and the zone 1

line of the message. These plots take the form of

winds. Zone wind data recorded in columns 7 and

vectors. The sum of the zone winds vectors is the

8 are entered for ballistic wind data in columns 9

ballistic wind.

and 10 of DA Form 4469. The value of the ballistic

(1) Orient Plotting Board ML-122 with the

wind for any given line is determined by consid-

spaced parallel lines running from the

ering the zone winds of all zones from the surface

top to the bottom of the plotting board.

to the standard height of that line. To obtain the

The top of the plotting board represents

ballistic wind for any line above line 1, a plot is

North.

made of the weighted wind effect of each zone

which contributes to the ballistic value for that

(2) Select origin points for the lines to be

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