19-39. This code (Figure 19-6) is actually five definite, meaningful symbols. Make these symbols a minimum of 4 meters (13 feet) wide and 6 meters (20 feet) long. If you make them larger, keep the same 2:3 ratio. The signal arms or legs should be 1 meter (3 feet) wide and 1 meter (3 feet) high to ensure maximum visibility from high altitudes. Ensure the signal contrasts greatly with the ground it is on. The signal may be constructed from any available materials; for example, aircraft parts, logs, or leaves. Remember size, ratio, angularity, straight lines, and square corners are not found in nature. You must consider how the signal will contrast with the natural background. The signal may be made by breaking and bending over crops or tall grass in a field or trampled down into snow or sandy soil. Place it in an open area easily spotted from the air. If evading, the signal could also be dug into the ground to reduce its signature from ground forces.
Figure 19-6. Ground-to-Air Emergency Code (Pattern Signals)
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