A Jon line is a cord used to secure yourself to the anchor line during your safety or decompression stops. This relieves you of having to hold on by hand, which can get tiring for long hangs in a strong current. You can also use a Jon line to get away from the crowd at 15 ft, while still being securely tethered to the boat.
There are a number of prefabricated Jon lines on the market that you can buy, along with several different gadgets to attach it to the anchor line, most of which are clever but not particularly reliable. For a few dollars, you can build a much better Jon line with parts from the hardware store. What you will need is:
- 6 ft of bungee cord - the kind with a fabric casing
- 2 brass snaps
- 6-8 wire ties
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