GROUND-TO-AIR DISTRESS SIGNALS
If a party is trapped or lost, and helicopter or airplane search parties are likely to be in the region, it may help to attempt to signal the aircraft. One way that this can be done is by creating ground-to-air distress signals, either by marking an open field or a riverbank that is visible from the air by stamping out large (8 to 10 ft, or 2.4 to 3 m) designs in the snow (in an open area), or by attracting attention with display patterns of clothing, rocks, fire rings, or the like. Figure 246 illustrates some standard ground markings for communication.
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