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 what rate?
- A30 to 50 times per minute
- B50 to 70 times per minute✓ correct
- C60 to 90 times per minute
- D70 to 100 times per minute
Why B is correct
33 CFR §87.01(p) specifies a high intensity white light flashing at regular intervals from 50 to 70 times per minute as a recognized distress signal. No other flash rate qualifies under this provision.
Cited:33 CFR §87.01
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