Vertical caving terminology and methods > Calls
Communication with whistles is very limited compared with the standard calls. There is no way to ask for slack, a tighter lifeline, or state that the rope is free. Therefore cavers should discuss these calls amongst themselves, and work out which calls will be used for what purpose. The following calls are generally understood, but since there is no real need to have both an up and down call in use at the same time, one of them might be re-purposed to state that a rope is free, while the other can then be used for something else.
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