What line is used to unfurl the jib?

The line used to unfurl the jib is called the furling line. This line is specifically designed for controlling the headsail on a roller-furling system, allowing the sailor to neatly roll the jib in and out, depending on the wind conditions and sail trim preferences. When unfurling the jib, the furling line is released, allowing the sail to unfurl as the forestay tension holds it in place.

Using the furling line properly is essential for efficient sail management and can help ensure a safer and more enjoyable sailing experience. This function is distinct from the other lines mentioned; for instance, the halyard is used for raising and lowering sails, the sheet is employed for adjusting the sail's angle to the wind, and the vang controls the leech tension of the mainsail, so none of these would be responsible for unfurling the jib.