For attracting attention of rescuers, make an SOS sign on an open place in large letters at least __ high.

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Multiple Choice

For attracting attention of rescuers, make an SOS sign on an open place in large letters at least __ high.

The essential idea is to maximize visibility from rescue aircraft. Letters that large are much easier to spot from overhead, so signifying SOS with tall characters increases the chance rescuers will notice you quickly. A height of about 12 feet (roughly 3.7 meters) is a practical minimum that can be read from typical air viewing distances, making the sign readable even from a few hundred meters away and in daylight. Smaller heights, like 6 or 10 feet, risk being missed when viewed from above, while going much taller than 12 feet can be impractical to create and maintain and isn’t necessary for visibility. Focus on a single, clear SOS message in high contrast on open ground to maximize recognition from the air.

The essential idea is to maximize visibility from rescue aircraft. Letters that large are much easier to spot from overhead, so signifying SOS with tall characters increases the chance rescuers will notice you quickly. A height of about 12 feet (roughly 3.7 meters) is a practical minimum that can be read from typical air viewing distances, making the sign readable even from a few hundred meters away and in daylight. Smaller heights, like 6 or 10 feet, risk being missed when viewed from above, while going much taller than 12 feet can be impractical to create and maintain and isn’t necessary for visibility. Focus on a single, clear SOS message in high contrast on open ground to maximize recognition from the air.

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