Vertical caving terminology and methods > Personal SRT gear
Used to enable minimal communication on noisy pitches, using whistle calls. Worn on a string around your neck (thin enough to snap if it gets caught), or attached to the chest harness. A whistle can easily be louder than a powerful waterfall (about 90-95 dB), and far louder than shouting (80 dB). If it is not loud enough, then a walkie talkie might be needed instead.
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