What is the purpose of a progress-capture device?

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Progress-capture devices are used to keep the litter from moving backward on a slope when the haul team isn’t actively lifting. Gravity will pull the load downward between haul cycles, and this device acts as a one-way brake on the haul line to lock the load in place. It grips to prevent the litter from falling back down the slope during pauses, while still allowing controlled movement when the team resumes hauling. This improves safety and efficiency by maintaining position so the next haul can begin smoothly. It isn’t primarily about managing rope tension during lifts, nor does it serve as an anchor along descent.