Aha Trivia Stuff Everyone Should Know
Aha Trivia: Stuff Everyone Should Know · ahatrivia.com/wfa-whistle-signal

What is a recognized whistle distress call?

Three blasts is the key point.

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  1. Three blasts ✔
  2. One blast each hour
  3. A continuous ten-minute blast

Why: Use three blasts as the distress call, then listen for a response. A whistle helps people find you and saves energy compared with yelling.

Huh, didn't know that: NPS recommends packing a whistle before an outdoor trip.

The dad joke
Why did the whistle get invited on every hike? It knew how to make a point in one blow.
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References

Answer: Three blasts. Use three blasts as the distress call, then listen for a response. A whistle helps people find you and saves energy compared with yelling.

  1. NPS Big Cypress Safety www.nps.gov/bicy/planyourvisit/safety.htm?fullweb=1
    three blasts on a whistle is a well-recognized distress call
    Checked 2026-10-21.
  2. NPS Outdoor Emergency Plan www.nps.gov/articles/gtgemergencyplan.htm
    Blowing a whistle helps people find you and saves your energy from yelling.
    Checked 2026-10-21.

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