Posted by Eins on September 30, 2000 at 19:54:05:
In Reply to: Re: Pardon my ignorance, but define "Jon Line" posted by Frank, AADIVER, Farmer on September 30, 2000 at 16:38:50:
Named for Jon Hulbert, a well-known NE wreck diver.
(copied that from Wrolf's page)
In addition to Gerry's answer, I think, by definition, a Jon line has a kind of hook that easily attaches and detaches to and from the anchor line without slipping up and down.
Eins