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It is much easer to buy a whistle. Believe it or not forest rangers said a whistle may be one of the most important survival devices you can carry. It uses a fraction of the energy that hollering does and you can only holler for a short time and the sound of a modern whistle will carry a lot farther. Remember the Titanic scene when the girl was saved by blowing the whistle when she was to cold and to tired to scream.
 

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True, you nailed it, a whistle carries farther, and takes less energy, A lot of people "yell themselves hoarse", then when rescuers are near, they cant yell. I agree it may be easier to buy one, but after learning how to, i never have to worry about it being left behind, lost, or frozen.
Yes it is good to know as it is another option. But could you whistle very loud if you were in the same condition as the girl in the scene.
 
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