Quick Answer
To signal at night with a whistle, use a series of short, distinct blasts on the whistle, ideally two to three times per minute, and repeat this pattern for a total of ten minutes. This alerts potential rescuers to your location without exhausting your energy or wasting valuable air. A whistle with a high-pitched sound is most effective for nighttime signaling.
Choosing the Right Whistle
When selecting a whistle for nighttime signaling, look for a device that produces a loud, high-pitched sound, typically in the range of 6,000 to 10,000 Hz. This frequency range is more easily audible over long distances, especially in windy or noisy conditions. A pea-less whistle is also recommended, as they tend to be more reliable in wet or icy conditions.
Signaling Techniques
To signal effectively at night, use a series of short, distinct blasts on the whistle, ideally two to three times per minute. This pace allows you to conserve energy while maintaining a consistent signal pattern. Repeat this pattern for a total of ten minutes, then pause for one to two minutes before resuming. This break allows you to rest and conserve energy while maintaining a consistent signal.
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