The bullet's exposure time to the wind determines the amount the bullet is deflected from its original trajectory. Deflection increases as the distance to the target increases. There are three factors that affect the amount of deflection of the bullet: velocity of the wind, range to the target, and velocity of the bullet.
• The greater the velocity of the wind, the more the bullet will be deflected.
• As the distance to the target increases, the speed of the bullet slows allowing the wind to have a greater effect on shot placement.
• A bullet with a high muzzle velocity will not be affected by the wind as much as a bullet with a low muzzle velocity.
b. Determining Windage Adjustments to Offset the Effects of Wind. The velocity and direction of the wind in relationship to the bullet must be determined to offset the wind's effects. If Marines can classify wind values and determine velocity within 5 mph, they can effectively engage targets in windy conditions.
(1) Wind Direction. Determine wind direction by observing the direction vegetation is moving, by feeling the wind blow against the body, or by observing the direction of a flag (in training).
1 (2) Wind Value Classifications. Winds are classified according to the direction from which
2 they are blowing in relation to the direction of fire. The clock system indicates wind direction
3 and value (see figure 8-2). Winds can be classified as half value, full value, or no value. The
4 target is always located at 12 o'clock.
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