The distress signal flash rate is approximately which range per minute?

The distress signal flash rate is approximately which range per minute?

• A. 20-30
• B. 40-50
• C. 50-60
• D. 60-70

Answer: (C)

A distress signal should flash at a steady, easy-to-detect pace. About one flash per second is ideal for visibility over distance and against the night background, which works out to roughly 60 flashes per minute. In practice, signaling devices are expected to operate within a small tolerance, so the typical range given is 50–60 flashes per minute. That cadence helps ensure the signal stands out and is quickly recognized as a distress indication. Smaller deviations, like much slower rates, can make the signal less noticeable or easier to ignore, while noticeably faster rates can be harder to gauge and may not be as reliably interpreted as a distress cue.

A distress signal should flash at a steady, easy-to-detect pace. About one flash per second is ideal for visibility over distance and against the night background, which works out to roughly 60 flashes per minute. In practice, signaling devices are expected to operate within a small tolerance, so the typical range given is 50–60 flashes per minute. That cadence helps ensure the signal stands out and is quickly recognized as a distress indication.

Smaller deviations, like much slower rates, can make the signal less noticeable or easier to ignore, while noticeably faster rates can be harder to gauge and may not be as reliably interpreted as a distress cue.