Jonline

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 line to the anchor line. In current this relieves the diver from holding on to the anchor line during the decompression stop.

The jonline is named after Jon Hulbert, who is credited with its invention.^[1]

A jonline is also often used to tether the diver's equipment to the dive boat before or after the dive. This enables the diver to get into or out of his or her equipment while in the water.

References

Diving decompression
General	Decompression (diving) Decompression equipment Decompression practice Decompression theory Equivalent air depth Equivalent narcotic depth History of decompression research and development Maximum operating depth
Algorithms	Bühlmann decompression algorithm Reduced gradient bubble model Thalmann algorithm Varying Permeability Model
Diving	Deep diving Professional diving Recreational diving Saturation diving Scuba diving Technical diving
Equipment	Decompression buoy Decompression tables Decompression trapeze Dive computer Diving chamber Diving shot Hyperbaric stretcher Jonline Recreational Dive Planner
Gases	Air Breathing gas Gas blending Heliox Nitrox Oxygen Trimix
Injury and treatment	Decompression sickness Diving chamber Hyperbaric medicine Hyperbaric treatment schedules In-water recompression
Procedures	Pyle stop Ratio decompression
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