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USCG Exam Practice · Rule 37 — Distress Signals

Under 33 CFR §87.01, a high intensity white light used as a distress signal must flash at which rate?

  1. A30 to 50 times per minute
  2. B50 to 70 times per minute✓ correct
  3. C60 to 90 times per minute
  4. D70 to 100 times per minute

Why B is correct

33 CFR §87.01(p) specifies that a high intensity white light flashing at regular intervals from 50 to 70 times per minute is an authorized distress signal. No other flash rate qualifies under this provision.

Cited:33 CFR §87.01

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