On a sailboat, a deck organizer is a device that helps to keep the various lines (ropes) neatly routed and organized.

What is a deck organizer used for?:
Guide lines: They guide lines from one part of the boat to another, such as from the mast to the winches in the cockpit.
Reduce clutter: By keeping lines organized, deck organizers prevent them from tangling and becoming a tripping hazard on the deck.
Improve efficiency: They make it easier and faster for the crew to handle lines, especially during maneuvers.
Protect lines: By guiding lines smoothly, they reduce wear and tear on the ropes.

Deck organizers are an important safety and efficiency feature on any sailboat, especially on larger boats with numerous lines.