How many whistle blasts for an emergency?

When you decide to stay put and wait for rescue, prepare help signals as soon as possible. The international emergency sign for distress is three of any signal: three shots, three blasts on a whistle, three flashes with a mirror, or three fires evenly spaced.



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Each whistle blast should last 3 seconds. Another important code is morse code of SOS which is three short blasts (3 seconds each), three long blasts (6 seconds each), and then another three short blasts (3 seconds each).

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The most important are: (1) visual signals, such as a flame, a red flare, an orange smoke signal, or a square flag displayed with a ball below; (2) sound signals, such as a gun or rocket fired at regular intervals, or a continuous sounding of a fog-signal apparatus; and (3) radio signals such as the Morse group SOS, ...

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