NRS Z-Drag Rescue Crib Sheet
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Here's what other sites are saying:
All the essential knots and boat retrieval techniques clearly illustrated and explained on durable waterproof paper that folds out. A great tool for clubs and schools as well as individual boaters. Information Included: Basic Z-drag 3:1 Vector Pull 2:1 Z+C 6:1 Double Z 9:1 Water Knot Double Fishermen's Knot Prusik Knot Double Figure 8 Knot Bowline Knot