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SDZ Construction: Single Firing Point, Single Target Inter-service Resident Range Safety Course (Intermediate)

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August 2003 SDZ Construction Fundamentals All SDZs, regardless of complexity, are drawn from a point or points of reference. To construct an accurate and precise SDZ, you will need the following: Compass for drawing circles and arcs Protractor for measuring angles Plotting scale for measuring distances Fine-point pencil for drawing accuracy

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August 2003 Degrees Scale Mils Scale Index

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August 2003 The M2 may be mounted on ground mounts and most vehicles as an anti-personnel and anti-aircraft weapon.

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August 2003 Weapon: Ammo: Distance X: Area A: Map Scale: Map Sheet: Map Series: Map Edition: Date: Name: Small Arms Legend (Cone)

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August 2003 Constructing a Cone-Shaped SDZ Construct a cone-shaped SDZ for the M2.50 MG using M2 ball ammo. Map scale: 1:50,000. Distance X for this weapon/ammo is given in DA-PAM , Appendix B, Table B-1. Cone-shaped SDZ dimensions are shown in DA-PAM , Figure 6-1.

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August 2003 Whats the Gun Target Line? The Gun Target Line, or GTL, is a line drawn between the firing point and the target. It is also referred to as the line of fire.

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August 2003 Plot the firing point. Gun Target Line Firing Point Establish the gun target line. Plot the target.

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August 2003 What is Distance X? Distance X is the maximum distance a projectile, to include guided missiles and rockets, will travel when fired or launched at a given quadrant elevation with a given charge or propulsion system.

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August 2003 From Table B-1, find Distance X M2 ball. Distance X = 6500m Annotate Distance X on the legend. Distance X

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August 2003 Determine the Dispersion Area The Dispersion Area is the area within the Surface Danger Zone located between the gun target line and the Ricochet Area. This area accounts for human error, gun or cannon tube wear, propellant temperature, etc.

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August 2003 At the firing point, measure 5° with a protractor from the left and right of the gun target line. Draw tic marks. 5° Distance X 5°

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August 2003 Gun Target Line 5° Dispersion Area This completes the Dispersion Area. To establish the limits of the Dispersion Area, draw a straight line from the firing position through each tic mark out to Distance X. Distance X 5°

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August 2003 Ricochet Area The Ricochet Area is located to the left and right of the Dispersion Area and contains projectiles after they make contact with the target medium.

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August 2003 At the firing point, measure 5° with a protractor from the left and right limits of the Dispersion Area. Draw tic marks. Dispersion Area 5° Distance X 5°

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August 2003 Dispersion Area Ricochet Area This completes the Ricochet Area. To establish the lateral limits of Ricochet Area, draw a straight line from the firing position through each tic mark out through Distance X. 5° Distance X 5°

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August 2003 Area A Area A is the secondary danger area, or buffer zone, that laterally parallels the Ricochet Area and contains fragments, debris, and components from frangible or explosive projectiles and warheads functioning on the right or left edge of the Ricochet Area. Area A measurement for direct-fire small arms without explosive projectiles is 100 meters.

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August 2003 To establish Area A, lightly draw lines perpendicular to the right and left limits of the Ricochet Area. Ricochet Area Dispersion Area Draw tic marks at 100 meters. Draw lines parallel to the limits of the Ricochet Area through the tic marks. Distance X

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August 2003 At the firing point, measure 30° with a protractor from the left and right limits of the Ricochet Area. Draw tic marks. Draw a straight line from the firing point through each tic mark. Ricochet Area Dispersion Area 30° Distance X 30°

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August ° From the firing point, scribe an arc between the left and right limits of Area A. Use Distance X as the radius. This completes Area A. Ricochet Area Dispersion Area To complete the SDZ, erase all unnecessary lines. Area A Annotate Area A on the legend. Distance X 30°

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August 2003 Ricochet Area Dispersion Area Area A From the firing point, scribe an arc between the left and right limits of Area A. Use Distance X as the radius. This completes Area A. To complete the SDZ, erase all unnecessary lines. Annotate Area A on the legend. Distance X

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August 2003 Weapon: M2.50 Machine Gun Ammo: M2 Ball Distance X: 6500m Area A: 100m Map Scale: 1:50,000 Map Sheet: Map Series: Map Edition: Date: Name: Small Arms Legend (Cone)

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