Jackline

Jacklines may be rigged temporarily when bad weather is expected, or, especially on sailboats heading offshore, they may be left in place all the time and used as necessary.

jackline
A safety line or wire running along the deck, cabin, or cockpit to which the crew hooks safety harness tethers.
jackstay ...

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Run in a Following Sea
How to Leave the Dock Under Power
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Personal Gear - Life Jackets, tethers, strobes, harnesses, jacklines
Distress Signaling - EPIRB's, Flare Kits, PLB's
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See also: High, Line, Lines, Overboard, Deck