The lifeline consists of a belt with snap hooks at each end. One of the carabiners is attached to the D-ring ( life belt or harness ) of the life jacket, the other end is attached to the rigging or the boat's mooring rope. Safe is safe!
The lifeline should be short enough to prevent falling overboard from the outset, i.e. the line should not exceed a length of 2 m (measured with carabiners).