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

What is a signal mirror useful for?

Flashing sunlight toward aircraft or searchers is the key point.

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  1. Keeping food cold overnight
  2. Flashing sunlight toward aircraft or searchers ✔
  3. Measuring a patient pulse

Why: Flash reflected sunlight toward people, planes, or helicopters that may see it. A mirror does not need batteries.

Huh, didn't know that: NPS includes a mirror among emergency signaling tools.

The dad joke
Why did the signal mirror get a job at the lighthouse? It had a bright future.
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References

Answer: Flashing sunlight toward aircraft or searchers. Flash reflected sunlight toward people, planes, or helicopters that may see it. A mirror does not need batteries.

  1. NPS Outdoor Emergency Plan www.nps.gov/articles/gtgemergencyplan.htm
    Flashing your mirror helps signal people if you become lost and mirrors don't run out of battery.
    Checked 2026-10-21.

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