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You just need a place where blowing a whistle wouldn't be out of the ordinary. Perhaps a city soccer/football field would work as people blow whistles there. Or if you could find an outdoor area ...

Very indoors, shut up tight, and at a suitable time of day. If you live in a house (as opposed to a flat), and it has reasonably good insulation and tight-fitting windows, the high-pitched sound of a ...

From Scouting For Girls, Official Handbook of the Girl Scouts Whistle Signals One blast, "Attention"; "Assemble" (if scattered). Two short blasts, "All right." Four ...

If anyone has hiked in the woods knows that noise may not travel very far, especially in dense forested areas. So the use of any whistle would imply that group members should be relatively close ...

Beyond the previously mentioned Scouting communication guidelines, Morse Code is definitely an option. However, Morse code isn't as widely known anymore and could potentially be misinterpreted as a ...

I'm sure this isn't what you were shooting for but using radios, satellite phones, cell phones, etc. would all count because they transmit the "noise" of your voice to your target where it is ...

Percussion Drums have been used historically to communicate over long distances in forested areas, so you could send messages simply by knocking on wood. Pick up a couple of hard sticks, and knock ...

I spent a summer with two brothers from the Dominican Republic and they would call out to each other with a loud howl-like "FOOOOOOOOOOOO" sound that carried very well through fields, forests, and ...

The nice thing about standards is that you have so many to choose from. - Andrew S. Tanenbaum While there are standards you and your companions need to know and agree upon what that standard is prior ...

... what qualities ...? immediate availability to the user not liable to cause injury to the user - cold, sharp edges, hearing, lanyard strangulation etc. health of the user - lung capacity, breath ...

The simplest, as opposed to the optimal, approximation is to assume the inverse square law holds such that there is a 6 dB drop in the pressure for every doubling of distance. If we assume that the ...

One alternative is to use animal calls. For instance, on a clear night an elk bugle call can be heard up to a mile away. There are also duck calls or push-to-call cow elk calls. These should not ...