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Jonline is a short line used by divers to fasten themselves to something like to an anchor line during decompression stops in current.
The line is typically around 1 m of webbing or cord and equipped with a clip at each end. One clip is fastened to the diver's harness, and the other is used to fasten the line to the anchor line.
The jonline is named after Jon Hulbert, who is credited with its invention.