The following are notes taken from Peak Rescue Institute while on location in Joshua Tree National Park. The scenario is a pick-off using an “offset” and more specific a “two rope offset system”. I choose to keep the audio on this video as it really calls out the importance of communication.
Offsets provide an amazing way of redirecting both patient and rescuer away from a wall, rock face, or other obstruction. We use offsets to move the patient and or rescuer through space where the tender does not have the ability to move the litter. Move the load only enough to clear the obstacle or span the gap.
Two-Rope Offset System
The two-rope offset system is used as an alternative to deflection lines or Tyrolean traverses when spanning large gaps. It incorporates two TTRRS (or two main/belay systems) that work together. While one system lowers, the other system raises.
In this evolution, the CMC MPD, in tandem, were used in both raise and lower systems. During the raise, the MPD is a super efficient change of direction pulley and progress capture. During the lower, the MPD makes the transition or change-over to the lower system amazingly simple.
Two rope systems are considered safer than highlines and the fact that highlines are rarely used (in real life), the training aspects with offset and particularly two rope offsets are much more productive. As with all large gap evolutions, communication is a critical component.
Of interest, did you happen to note that the hauler’s grap both ropes simultaneously? In other words, the twin hauling system is being treated as a single mechanical advantage system. Please don’t breeze past this! This is not a common practice with most teams. Also, in the real world, any given team will never have this many “haulers”, which make this point even more so. Scene management, communication, efficiency and single line focus (if at all possible) if very important.
Peace on your days
Lance
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