
A Jonline is a short line used by SCUBA-divers to fasten themselves to something. For example, it is used to fasten a diver to an anchor line during decompression stops in current. The line is typically around 1 m (3 feet) long 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 l....
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http://en.wikipedia.org/wiki/Jonline

a short line line with a hook device, often used by scuba divers to fasten themselves to any thickness anchor or down line. Jonline helps the diver to stay in the water column regardless of wave action during decompression stops.
Found on
https://dipndive.com/blogs/stories/diving-lingo-101-glossary-of-terms-phras

A line designed to attach to an anchor other attachment at the bottom of the seafloor. This helps guide divers to the site and allows the diver to stay in the water column regardless of wave action during decompression stops.
Found on
https://www.scubadiving.com/dive-speak-learn-scuba-diving-terms-phrases-and
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